A breathtaking, high-octane conspiracy thriller from the No.1 Amazon bestselling duo – perfect for fans of Tess Gerritsen and Michael Crichton

“A fast-paced conspiracy thriller that stays suspenseful and unsettling to the very last page.” Emlyn Rees, bestselling author of Hunted

A terrifying enigma – with the power to destroy…

Twenty years ago, Kate Maddox was a volunteer at a research centre where scientists hunted for a cure for the common cold virus. That summer, Kate fell in love with a handsome young doctor, Stephen, but her stay ended in his tragic death and Kate fled to a new life in the US.

Now Kate is back in England and on the run with her young son, this time from her vile husband. But a chance encounter 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 psychotic killer who is obsessed with his prey, Kate must fight to solve the puzzle of the past – uncovering a sickening betrayal and a truth more horrifying than she could ever have imagined…