Past Life by Dominic Nolan

Second Hand 

From a blistering new voice in crime fiction, PAST LIFE is a daringly original, razor-sharp debut perfect for fans of Susie Steiner, Ian Rankin and Joseph Knox. WHAT HAPPENED TO ABIGAIL BOONE? Waking up beside the dead girl, she couldn't remember anything. Who she was. Who had taken her. How to escape. Detective Abigail Boone has been missing for four days when she is finally found, confused and broken. Suffering retrograde amnesia, she is a stranger to her despairing husband and bewildered son. Lost in her own life, with no leads on her abduction, Boone's only instinct is to return to the deadly investigation that almost killed her: a baffling missing persons case that drags her to the darkest edges of human cruelty.