Jacques Saunière, a Louvre curator, is pursued through the Grand Gallery by an albino Catholic monk named Silas, who demands the location of the Priory's "keystone" to find and destroy the Holy Grail. Saunière gives him a false lead and is murdered. The police find his body posed like Da Vinci's "Vitruvian Man". Police captain Bezu Fache has his lieutenant, Jérôme Collet, summon American symbologist Robert Langdon, who is in Paris for a lecture on the interpretation of symbols, to examine Saunière's body.