Based on the real life story of legendary cryptanalyst Alan Turing, the film portrays the nail-biting race against time by Turing and his brilliant team of code-breakers at Britain's top-secret Government Code and Cypher School at Bletchley Park, during the darkest days of World War II.
An awkward office drone becomes increasingly unhinged after a charismatic and confident look-alike takes a job at his workplace and seduces the woman he desires.