The Woman He Used to Know by Helen Starbuck

Mistakes, Regrets, and Murder

Denver homicide detective Nick Ryan and Elizabeth Harper have a history of passionate mistakes and broken trust. They haven’t seen each other in five years after she married a man he despised. Now, her husband is dead, and the evidence points to her as the killer. 

The woman Nick used to know wouldn’t have killed anyone. But she’s the prime suspect and has many reasons to want her husband dead. Hasty decisions have brought Nick and Elizabeth to a strange and bloody crossroads. He’s worried his feelings for her will help her get away with murder, and she’s worried they’ll land her in prison.