The Name of the Rose (1986)

In the 14th century, Franciscan monk William of Baskerville, accompanied by his eager novice, arrives at a monastery hosting a conference, only to discover a series of baffling murders among the monks. Determined to uncover the truth, William faces the formidable power of the Church and confronts a hidden network of conspiratorial monks, relying solely on his sharp intellect to navigate the treacherous waters of faith and secrecy.