Langdon felt utterly spent as he and Sophie hurdled a turnstile at the Temple tube station anddashed deep into the grimy labyrinth of tunnels and platforms. The guilt ripped through him.

　　I involved Leigh, and now he's in enormous danger.

　　Rémy's involvement had been a shock, and yet it made sense. Whoever was pursuing the Grail hadrecruited someone on the inside. They went to Teabing's for the same reason I did. Throughouthistory, those who held knowledge of the Grail had always been magnets for thieves and scholarsalike. The fact that Teabing had been a target all along should have made Langdon feel less guiltyabout involving him. It did not. We need to find Leigh and help him. Immediately.

　　Langdon followed Sophie to the westbound District and Circle Line platform, where she hurried toa pay phone to call the police, despite Rémy's warning to the contrary. Langdon sat on a grungybench nearby, feeling remorseful.

　　"The best way to help Leigh," Sophie reiterated as she dialed, "is to involve the London authoritiesimmediately. Trust me."Langdon had not initially agreed with this idea, but as they had hatched their plan, Sophie's logicbegan to make sense. Teabing was safe at the moment. Even if Rémy and the others knew wherethe knight's tomb was located, they still might need Teabing's help deciphering the orb reference.

　　What worried Langdon was what would happen after the Grail map had been found. Leigh willbecome a huge liability.

　　If Langdon were to have any chance of helping Leigh, or of ever seeing the keystone again, it wasessential that he find the tomb first. Unfortunately, Rémy has a big head start.

　　Slowing Rémy down had become Sophie's task.

　　Finding the right tomb had become Langdon's.

　　Sophie would make Rémy and Silas fugitives of the London police, forcing them into hiding or,better yet, catching them. Langdon's plan was less certain—to take the tube to nearby King'sCollege, which was renowned for its electronic theological database. The ultimate research tool,Langdon had heard. Instant answers to any religious historical question. He wondered what thedatabase would have to say about "a knight a Pope interred."He stood up and paced, wishing the train would hurry.

　　At the pay phone, Sophie's call finally connected to the London police.

　　"Snow Hill Division," the dispatcher said. "How may I direct your call?""I'm reporting a kidnapping." Sophie knew to be concise.

　　"Name please?"Sophie paused. "Agent Sophie Neveu with the French Judicial Police."The title had the desired effect. "Right away, ma'am. Let me get a detective on the line for you."As the call went t............