When the Chips are Down — H.D. Thomson

When Skye steps into a horrifying scene in Boston. She comes to finally realize why the killers want her son. Someone systematically erased her memories from her past for a reason, and she know realizes just what that reason is, and how she's danced as a puppet in the killer's sick and morbid play. David, the police, no one can stop the killers. Not even herself. She'd been a fool to think she was strong enough, brave enough, smart enough to vanquish a killer with no scruples, empathy or humanity. David has followed Skye to Boston, but by following her, has he endangered her and her son far more than if he'd remained behind? He'll soon find out or … die trying.