When a stadium is seized by a group of heavily armed criminals during a major sporting event, an ex-soldier must use all his military skills to save both the daughter of a fallen comrade and the huge crowd unaware of the danger.

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.