Four interlinked adventures in time and space to mark Doctor Who's 45th anniversary, featuring the Seventh Doctor, Ace and Hex. In Egypt, archaeologist Howard Carter unearths an ancient secret buried in the Valley of the Kings. On an island of Mendolovinia, a deranged academic attempts to push back the frontiers of the human mind. In war-torn London, a cockney spiv takes possession of a bizarre alien object. And in a military bunker in the cold heart of Antarctica, the strangest and deadliest of the Doctor's many enemies lies in wait... Dr Verryman has devoted his life to the advancement of knowledge. When his experiments on a remote planet threaten the entire human race only the Doctor can help - if he puts his mind to it.