symbologist Robert Langdon, who is in Paris for a lecture on the interpretation of symbols, to examine Saunière's body. Langdon is shown the body and a secret message, readable only by blacklight. It contains an out-of-order Fibonacci sequence. Sophie Neveu, a police cryptographer and Saunière's granddaughter, tells Langdon that Fache planted a tracker on him after finding the words, "P.S. Find Robert Langdon" at the end of Saunière's secret message. Fache believes that Langdon murdered Saunière. Sophie throws away the tracker, distracting the police while they sneak around the Louvre, finding more clues in Leonardo da Vinci's works. Langdon deduces that Saunière was the grand master of the Priory of Sion. Silas works for an anonymous person referred to as "The Teacher", along with members of Opus Dei, led by Bishop Aringarosa. Langdon and Sophie travel to a French bank and access Saunière's safe deposit box by using the Fibonacci sequence. Inside is a cryptex, a cylindrical container that contains a message on papyrus. It can only be opened without destroying the contents by turning dials to spell a code word. As the police arrive, bank manager Andre Vernet helps Langdon and Sophie escape, then attempts to steal the cryptex and murder them. Langdon and Sophie escape with the cryptex. They visit Langdon's friend, Sir Leigh Teabing, a Holy Grail expert. Teabing claims the Grail is not a cup but instead is Mary Magdalene. He says she was not a prostitute but the wife of Jesus Christ. Teabing argues that Mary was pregnant during his crucifixion, and the Priory was formed to protect their descendants. The Opus Dei have been trying to destroy the Grail to preserve the credibility of the Vatican. Later, Silas breaks into Teabing's house, but Teabing, who uses crutches, uses one to disable him. The group escapes to London via Teabing's private plane, along with his butler, Remy Jean. Their interpretation of a clue hidden in the cryptex box leads them to the Temple Church, where they find nothing. Remy, who claims to be the Teacher, frees Silas. Remy takes Teabing hostage, dumping him in the car trunk, and taking Silas to hide out in an Opus Dei safe house. Teabing, who is revealed as the Teacher, later poisons Remy and sends the police after Silas. Police shoot Silas after accidentally wounding Aringarosa, who is promptly arrested by Fache, who resents being used to hunt Langdon.