בעקבות רצח שהתבצע במוזיאון הלובר, מוזעק למקום חוקר הסמלים רוברט לנגדון. יחד עם נכדתו של הנרצח הוא יוצא לפענח את הפרשה המסתורית.

Surviving the plane crash was only the beginning ... After their plane crashes into uncharted territory in the Himalayas, the survivors set out to find help in the freezing cold. As the days pass and with no sign of a rescue, tensions begin to mount. The survivors wrestle with their consciences as they realise that in order to survive, they must use the bodies of the dead as food. But when it appears that something else is already feeding upon the dead, the survivors realise that their biggest danger is not hunger but something infinitely more sinister: a legendary Yeti is stalking them and is moving in for the kill. Can they outsmart the beast or will they die trying?

Sebastian is an undisciplined mathematics genius who works in the "cipher bureau" of the British Intelligence. While cracking enemy codes, Sebastian finds time to romance co-worker Rebecca Howard.

Alan Turing is the genius British mathematician who was instrumental in breaking the German naval Enigma Code during World War II, arguably saving millions of lives. Turing's achievements went unrecognised during his lifetime. Instead he ended up being treated as a common criminal, for being homosexual at a time when homosexual acts were a crime. In 1952, he was convicted of 'gross indecency' with another man and was forced to undergo so-called 'organo-therapy' - chemical castration. Two years later, he killed himself with cyanide, aged just 41. Alan Turing was driven to a terrible despair and early death by the nation he'd done so much to save.

Cryptozoologists journey into the forests of Kentucky to gather evidence of a canine/human hybrid.