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 the Depository Bank of Zurich 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 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.