Sir Alistair Lethbridge-Stewart is nearing the end of his life and has just buried another old friend. Feeling out of sorts, he is somewhat surprised to find himself in 1981. Some mysterious force has pulled him backwards in time, into his own past, an adventure he has only vague memories of... 1981: London, a bomb detonates in a London pub and Brigadier Alistair Lethbridge-Stewart is among the injured. Moscow, a hijacked plane sits on the airport runway and Major Grigoriy Bugayev leads the assault against the six gunmen holding the passengers hostage. These are the triggers that set the two military men on an international manhunt. Their investigations converge and uncover a group of terrorists whose roots reach back to sinister Cold War experiments, and something that was unearthed in ancient ruins in the New Mexico desert by one Sophia Montilla… and Anne Travers. Terror is a contagion. It means to spread. And humanity is set on doing everything in its power to help it…

Dame Anne Bishop learned a long time ago that for every fixed point in time, this a fracture point, an event that is susceptible to catastrophic changes in the timeline. And when she is catapulted back in time, she discovers first hand that February 1969 is one such point. Colonel Lethbridge-Stewart is on manoeuvres with the Scots Guards in Libya. Only, he’s about to receive a call from his old commanding officer, Colonel Spencer Pemberton. A call that will drag him to London, and set him on a direct course for destiny! The London Event, the trap set for the Doctor by the Great Intelligence, changed the course of human history, and for Anne Travers it set into place a series of events that would see the death of her father barely a year later. Now, waking up in the body of a woman she barely knows, Dame Anne is faced with the idea that perhaps she can change things – not enough to damage the timeline, but enough to save her father. Future and past are set to collide, which could have irrevocable consequences for the timeline…