Unveiling an enigma books published

Everyone knows something of Alan Turing: the shy, socially inept, stuttering genius who saved his country in its blackest hour by cracking German naval Enigma codes at Bletchley Park, but was then harassed into committing suicide by an ungrateful state. Many will also have some vague inkling that Turing `invented the computer?? ?? though most would be challenged to explain his actual contribution.