After the death of a pope, the conclave of cardinals that meets to elect his successor are sworn to secrecy. As a result, the proceedings, which traditionally take place in the Vatican’s Sistine Chapel, are perfect fodder for authors and filmmakers. In the movie Conclave—out in theaters today (Oct. 25) and based on Robert Harris’s eponymous 2016 thriller—a group of cardinals played by Ralph Fiennes, Stanley Tucci, John Lithgow, and Lucian Msamati are rattled by secrets about one another revealed during the voting process.