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Langdon pulled Peter’s ring from his pocket and read the inscription. Then he glanced back at the pot of

water. “Sorry, you lost me.”

“Robert, earlier tonight, we all assumed ‘thirty-third degree’ referred to the Masonic degree, and yet when

we rotated that ring thirty-three degrees, the cube transformed and revealed a cross. At that moment, we

realized the word degree was being used in another sense.”

“Yes. Degrees of arc.”

“Exactly. But degree has a third meaning as well.”

Langdon eyed the pot of water on the stove. “Temperature.”

“Exactly!” she said. “It was right in front of us all night. ‘All is revealed at the thirty-third degree.’ If we

bring this pyramid’s temperature to thirty-three degrees . . . it may just reveal something.”

Langdon knew Katherine Solomon was exceptionally bright, and yet she seemed to be missing a rather

obvious point. “If I’m not mistaken, thirty-three degrees is almost freezing. Shouldn’t we be putting the

pyramid in the freezer?”

Katherine smiled. “Not if we want to follow the recipe written by the great alchemist and Rosicrucian mystic

who signed his papers Jeova Sanctus Unus.”

Isaacus Neutonuus wrote recipes?

“Robert, temperature is the fundamental alchemical catalyst, and it was not always measured in Fahrenheit

and Celsius. There are far older temperature scales, one of them invented by Isaac—”

“The Newton Scale!” Langdon said, realizing she was right.

“Yes! Isaac Newton invented an entire system of quantifying temperature based entirely on natural

phenomena. The temperature of melting

ice was Newton’s base point, and he called it ‘the zeroth degree.’ ” She paused. “I suppose you can guess

what degree he assigned the temperature of boiling water—the king of all alchemical processes?”

“Thirty-three.”

“Yes, thirty-three! The thirty-third degree. On the Newton Scale, the temperature of boiling water is thirty-

three degrees. I remember asking my brother once why Newton chose that number. I mean, it seemed so

random. Boiling water is the most fundamental alchemical process, and he chose thirty-three? Why not a

hundred? Why not something more elegant? Peter explained that, to a mystic like Isaac Newton, there was no

number more elegant than thirty-three.”

All is revealed at the thirty-third degree. Langdon glanced at the pot of water and then over at the pyramid.

“Katherine, the pyramid is made out of solid granite and solid gold. Do you really think boiling water is hot

enough to transform it?”

The smile on her face told Langdon that Katherine knew something he did not know. Confidently, she

walked over to the island, lifted the gold-capped, granite pyramid, and set it in the strainer. Then she

carefully lowered it into the bubbling water. “Let’s find out, shall we?”

High above the National Cathedral, the CIA pilot locked the helicopter in auto-hover mode and surveyed the

perimeter of the building and the grounds. No movement. His thermal imaging couldn’t penetrate the

cathedral stone, and so he couldn’t tell what the team was doing inside, but if anyone tried to slip out, the

thermal would pick it up.

It was sixty seconds later that a thermal sensor pinged. Working on the same principle as home-security

systems, the detector had identified a strong temperature differential. Usually this meant a human form

moving through a cool space, but what appeared on the monitor was more of a thermal cloud, a patch of hot

air drifting across the lawn. The pilot found the source, an active vent on the side of Cathedral College.

Probably nothing, he thought. He saw these kinds of gradients all the time. Someone cooking or doing

laundry. As he was about to turn away, though, he realized something odd. There were no cars in the parking

lot and no lights on anywhere in the building.

He studied the UH-60’s imaging system for a long moment. Then he radioed down to his team leader.

“Simkins, it’s probably nothing, but . . .”

“Incandescent temperature indicator!” Langdon had to admit, it was clever.

“It’s simple science,” Katherine said. “Different substances incandesce at different temperatures. We call

them thermal markers. Science uses these markers all the time.”

Langdon gazed down at the submerged pyramid and capstone. Wisps of steam were beginning to curl over

the bubbling water, although he was not feeling hopeful. He glanced at his watch, and his heart rate

accelerated: 11:45 P.M. “You believe something here will luminesce as it heats up?”

“Not luminesce, Robert. Incandesce. There’s a big difference. Incandescence is caused by heat, and it occurs

at a specific temperature. For example, when steel manufacturers temper beams, they spray a grid on them

with a transparent coating that incandesces at a specific target temperature so they know when the beams are

done. Think of a mood ring. Just put it on your finger, and it changes color from body heat.”

“Katherine, this pyramid was built in the 1800s! I can understand a craftsman making hidden release hinges

in a stone box, but applying some kind of transparent thermal coating?”

“Perfectly feasible,” she said, glancing hopefully at the submerged pyramid. “The early alchemists used

organic phosphors all the time as thermal markers. The Chinese made colored fireworks, and even the

Egyptians—” Katherine stopped midsentence, staring intently into the roiling water.

“What?” Langdon followed her gaze into the turbulent water but saw nothing at all.

Katherine leaned in, staring more intently into the water. Suddenly she turned and ran across the kitchen

toward the door.

“Where are you going?” Langdon shouted.

She slid to a stop at the kitchen light switch, flipped it off. The lights and exhaust fan went off, plunging the

room into total darkness and silence. Langdon turned back to the pyramid and peered through the steam at

the capstone beneath the water. By the time Katherine made it back to his side, his mouth had fallen open in

disbelief.

Exactly as Katherine had predicted, a small section of the metal capstone was starting to glow beneath the

water. Letters were starting to appear, and they were getting brighter as the water heated up.

“Text!” Katherine whispered.

Langdon nodded, dumbstruck. The glowing words were materializing just beneath the engraved inscription

on the capstone. It looked like only three words, and although Langdon could not yet read what the words

said, he wondered if they would unveil everything they had been looking for tonight. The pyramid is a real

map, Galloway had told them, and it points to a real location.

As the letters shone brighter, Katherine turned off the gas, and the water slowly stopped churning. The

capstone now came into focus beneath the water’s calm surface.

Three shining words were clearly legible.

CHAPTER 90

In the dim light of the Cathedral College kitchen, Langdon and Katherine stood over the pot of water and

stared at the transformed capstone beneath the surface. On the side of the golden capstone, an incandescent

message was glowing.

Langdon read the shining text, scarcely able to believe his eyes. He knew the pyramid was rumored to reveal

a specific location . . . but he had never imagined that the location would be quite this specific.

Eight Franklin Square

“A street address,” he whispered, stunned.

Katherine looked equally amazed. “I don’t know what’s there, do you?”

Langdon shook his head. He knew Franklin Square was one of the older sections of Washington, but he

wasn’t familiar with the address. He looked at the tip of the capstone, and read downward, taking in the

entire text.

The

secret hides

within The Order

Eight Franklin Square

Is there some kind of Order on Franklin Square?

Is there a building that hides the opening to a deep spiral staircase?

Whether or not there was actually something buried at that address, Langdon had no idea. The important

issue at this point was that he and Katherine had deciphered the pyramid and now possessed the information

required to negotiate Peter’s release.

And not a moment too soon.

The glowing arms on Langdon’s Mickey Mouse watch indicated that they had less than ten minutes to spare.

“Make the call,” Katherine said, motioning to a phone on the wall in the kitchen. “Now!”

The sudden arrival of this moment startled Langdon, and he found himself hesitating.

“Are we sure about this?”

“I most certainly am.”

“I’m not telling him anything until we know Peter is safe.”

“Of course not. You remember the number, right?”

Langdon nodded and made his way over to the kitchen phone. He lifted the receiver and dialed the man’s

cell-phone number. Katherine came over and placed her head next to his so she could listen in. As the line

began to ring, Langdon prepared himself for the eerie whisper of the man who had tricked him earlier

tonight.

Finally, the call connected.

There was no greeting, though. No voice. Only the sound of breathing at the other end.

Langdon waited and then finally spoke. “I have the information you want, but if you want it, you’ll have to

give us Peter.”

“Who is this?” a woman’s voice replied.

Langdon jumped. “Robert Langdon,” he said reflexively. “Who are you?” For an instant he thought he must

have dialed incorrectly.

“Your name is Langdon?” The woman sounded surprised. “There’s someone here asking for you.”

What? “I’m sorry, who is this?”

“Officer Paige Montgomery with Preferred Security.” Her voice seemed shaky. “Maybe you can help us with

this. About an hour ago, my partner responded to a 911 call in Kalorama Heights . . . a possible hostage

situation. I lost all contact with her, and so I called backup and came to check the residence. We found my

partner dead in the backyard. The home owner was gone, and so we broke in. A cell phone was ringing on

the hall table, and I—”

“You’re inside?” Langdon demanded.

“Yes, and the 911 tip . . . was a good one,” the woman stammered. “Sorry if I sound rattled, but my partner’s

dead, and we found a man being held here against his will. He’s in bad shape, and we’re working on him

now. He’s been asking for two people—one named Langdon and one named Katherine.”

“That’s my brother!” Katherine blurted into the receiver, pressing her head closer to Langdon’s. “I made the

911 call! Is he okay?!”

“Actually, ma’am, he’s . . .” The woman’s voice cracked. “He’s in bad shape. He’s missing his right hand . .

.”

“Please,” Katherine urged. “I want to talk to him!”

“They’re working on him at the moment. He’s in and out of consciousness. If you’re anywhere in the area,

you should get over here. He obviously wants to see you.”

“We’re about six minutes away!” Katherine said.

“Then I suggest you hurry.” There was a muffled noise in the background, and the woman then returned to

the line. “Sorry, it looks like I’m needed. I’ll speak to you when you arrive.”

The line went dead.

CHAPTER 91

Inside Cathedral College, Langdon and Katherine bounded up the basement stairs and hurried down a

darkened hallway looking for a front exit. No longer did they hear the sounds of helicopter blades overhead,

and Langdon felt hopeful they could slip out unseen and find their way up to Kalorama Heights to see Peter.

They found him. He’s alive.

Thirty seconds earlier, when they’d hung up with the female security guard, Katherine had hurriedly hoisted

the steaming pyramid and capstone out of the water. The pyramid was still dripping when she lowered it into

Langdon’s leather bag. Now he could feel the heat radiating through the leather.

Excitement over Peter’s discovery had temporarily trumped any further reflection on the capstone’s glowing

message—Eight Franklin Square— but there would be time for that once they got to Peter.

As they rounded the corner at the top of the stairs, Katherine stopped short and pointed into a sitting room

across the hall. Through the bay window, Langdon could see a sleek black helicopter sitting silent on the

lawn. A lone pilot stood beside it, facing away from them and talking on his radio. There was also a black

Escalade with tinted windows parked nearby.

Staying in the shadows, Langdon and Katherine moved into the sitting room, and peered out the window to

see if they could see the rest of the field team. Thankfully, the huge lawn outside the National Cathedral was

empty.

“They must be inside the cathedral,” Langdon said.

“They’re not,” a deep voice said behind them.

Langdon and Katherine wheeled around to see who had spoken. In the doorway of the sitting room, two

black-clad figures aimed laser-sighted rifles at them. Langdon could see a glowing red dot dancing on his

chest.

“Nice to see you again, Professor,” said a familiar raspy voice. The agents parted, and the tiny form of

Director Sato sliced effortlessly through, crossing the sitting room and stopping directly in front of Langdon.

“You’ve made some exceedingly poor choices tonight.”

“The police found Peter Solomon,” Langdon declared forcefully. “He’s in bad shape, but he’ll live. It’s

over.”

If Sato was surprised Peter had been found, she did not show it. Her eyes were unflinching as she walked to

Langdon and stopped only inches away. “Professor, I can assure you, this is nowhere near over. And if the

police are now involved, it has only become more serious. As I told you earlier this evening, this is an

extremely delicate situation. You never should have run away with that pyramid.”

“Ma’am,” Katherine blurted, “I need to see my brother. You can have the pyramid, but you must let—”

“I must?” Sato demanded, spinning to Katherine. “Ms. Solomon, I assume?” She stared at Katherine with fire

in her eyes and then turned back to Langdon. “Put the leather bag on the table.”

Langdon glanced down at the pair of laser sights on his chest. He set the leather bag on the coffee table. An

agent approached cautiously, unzipped the bag, and pulled the two sides apart. A little puff of trapped steam

billowed up out of the bag. He aimed his light inside, stared for a long, puzzled moment, and then nodded to