By: Kristy Puchko Last year Jake Gyllenhaal showed us a more mind-bending side to the thriller genre with Duncan Jones’ time-travel mystery Source Code, and next he’ll tackle a tale of doppelgangers with Denis Villeneuve’s An Enemy. Based on the José Saramago book inspired by the Fyodor Dostoevsky novella The Double, the film will star Gyllenhaal as a history teacher whose life is thrown off …