June 1924. On the brutal North East Ridge of Mount Everest, famous adventurers George Mallory and Andrew Irvine vanish into the snow-whipped night. Daredevil explorer Richard Deacon devises a plan to follow in the men's footsteps, accompanied only by two friends. Off piste and with no support team, the three men strike for Everest's peak and the most vicious climate on earth. As the winds rise and the temperature and oxygen levels drop, Deacon and his companions hear howls in the distance. Some dark creature is tracking them up the mountain, sending them scrabbling blindly into Everest's dangerous heights to escape it. Soon they will discover what happened to Mallory's crew but can they escape the same hideous fate?.