Warner Bros. Pictures Espaana.

A woman is murdered in Oxford. Her body is discovered by two men who meet for the first time at that moment: Arthur Seldom, a prestigious professor of logic, and Martin, a young graduate student who has just arrived at the University hoping to study with Seldom. It quickly becomes clear that this is the first in a series of murders, all of which are announced by the murderer with strange mathematical symbols. Professor and student join forces to try...