Gordon Welchman was one of the original elite codebreakers crucial to the allies defeating the Nazis in World War II. He is the forgotten genius of Bletchley Park. Filmed extensively at Bletchley Park, the centre for codebreaking operations during World War II, this documentary features the abandoned buildings where thousands of people worked tirelessly to crack the codes. Post-war, Welchman moved to the US to be at the centre of the computer revolution. Recently released top secret documents reveal that the case of Gordon Welchman reached the desk of the British prime minister, Margaret Thatcher, and then led to questions being asked in the House of Commons after Welchman's untimely death. Welchman's legacy continues to this day. Welchman's pioneering work in the field of traffic analysis led directly to the modern secret surveillance state, and particularly the use of metadata - as revealed by whistleblower Edward Snowden.

Six private school students spend a night patrolling the eerie grounds of the historic Dhoultham School as part of a British Army initiative to provide rich kids with basic military training. As each hour passes they witness a series of increasingly disturbing occurrences, slamming doors, self-governing lights and ghostly apparitions. The ante is upped by two thieves who have chosen the night to conduct a heist on the school Archive: a vault of priceless historical documents. As the supernatural encounters begin to take an increasingly malevolent turn, the students realise they must escape Dhoultham before the night's end.