Michael Collins plays a crucial role in the establishment of the Irish Free State in the 1920s, but becomes vilified by those hoping to create a completely independent Irish republic.

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.