e should get out of here,” Langdon said to Katherine. “It’s only a matter of time before they figure out where we are.” He hoped Bellamy had managed to escape.

Katherine still seemed fixated on the gold capstone, looking incredulous that the inscription was so unhelpful. She had taken the capstone out of the box, examined every side, and was now carefully putting it back in the box.

The secret hides within The Order, Langdon thought. Big help.

Langdon found himself wondering now if perhaps Peter had been misinformed about the contents of the box. This pyramid and capstone had been created long before Peter was born, and Peter was simply doing as his forefathers had told him, keeping a secret that was probably as much a mystery to him as it was to Langdon and Katherine.

What did I expect? Langdon wondered. The more he learned tonight about the Legend of the Masonic Pyramid, the less plausible it all seemed. I’m searching for a hidden spiral staircase covered by a huge stone? Something told Langdon he was chasing shadows. Nonetheless, deciphering this pyramid seemed his best chance at saving Peter.

“Robert, does the year 1514 mean anything to you?”

Fifteen-fourteen? The question seemed apropos of nothing. Langdon shrugged. “No. Why?”

Katherine handed him the stone box. “Look. The box is dated. Have a look under the light.”

Langdon took a seat at the desk and studied the cube-shaped box beneath the light. Katherine put a soft hand on his shoulder, leaning in to point out the tiny text she had found carved on the exterior of the box, near the bottom corner of one side.

“Fifteen-fourteen A.D.,” she said, pointing into the box.

Sure enough, the carving depicted the number 1514, followed by an unusual stylization of the letters A and D.

“This date,” Katherine was saying, sounding suddenly hopeful, “maybe it’s the link we’re missing? This dated cube looks a lot like a Masonic cornerstone, so maybe it’s pointing to a real cornerstone? Maybe to a building built in 1514 A.D.?”

Langdon barely heard her.

Fifteen-fourteen A.D. is not a date.

The symbol, as any scholar of medieval art would recognize, was a well-known symbature—a symbol used in place of a signature. Many of the early philosophers, artists, and authors signed their work with their own unique symbol or monogram rather than their name. This practice added a mysterious allure to their work and also protected them from persecution should their writings or artwork be deemed counterestablishment.

In the case of this symbature, the letters A.D. did not stand for Anno Domini . . . they were German for something else entirely.

Langdon instantly saw all the pieces fall into place. Within seconds, he was certain he knew exactly how to decipher the pyramid. “Katherine, you did it,” he said, packing up. “That’s all we needed. Let’s go. I’ll explain on the way.”

Katherine looked amazed. “The date 1514 A.D. actually means something to you?”

Langdon winked at her and headed for the door. “A.D. isn’t a date, Katherine. It’s a person.”