The bestselling conspiracy thriller that has become a sensation. Imagine if Dan Brown, Steig Larsson and Michael Crichton sat down together to write a fast-paced medical conspiracy thriller set in the English countryside, featuring evil scientists, stone-cold killers, a deadly virus and a beautiful but vulnerable Harvard professor. Twenty years ago, Kate Maddox was a volunteer at a research unit where scientists experimented to find a cure for the common cold. That summer, Kate fell in love with a handsome young doctor, Stephen. But her stay at the unit ended in Stephen's tragic death and Kate fled a new life in the US! Now, Kate is back in England and on the run again with her young son -- this time, from her cruel husband. But a chance encounter with Stephen's twin brother, Paul, sets her on a terrifying path of discovery. What really happened at the Cold Research Unit two decades ago? Pursued by both her estranged husband and a psychopathic killer who has an unhealthy obsession with his quarry, Kate must fight to solve the puzzles of the past -- uncovering a sickening betrayal and a truth more terrifying that she could ever have imagined.