The Ex by Alafair Burke

Twenty years ago she ruined his life. Now she has the chance to save it.

Widower Jack Harris has resisted the dating scene ever since the shooting of his wife Molly by a 15yo boy three years ago. An early morning run changes that when he spots a woman in last night's party dress, barefoot, enjoying a champagne picnic alone, reading his favorite novel. Eager to help Jack, his friend posts a message on a popular website after he mentions the encounter. Days later, the beautiful stranger responds and invites Jack to meet her. That's when Jack's world falls apart. 

Olivia Randall is one of New York City's best criminal defense lawyers. When she hears that her former fiancé, Jack Harris, has been arrested for a triple homicide--and that one of the victims was connected to his wife's murder--there is no doubt in her mind as to his innocence. The only question is who would go to such great lengths to frame him--and why? For Olivia, representing Jack is a way to make up for past regrets, to absolve herself of guilt from a tragic decision, a secret she has held for twenty years. But as the evidence against him mounts, she is forced to confront her doubts. The man she knew could not have done this. But what if she never really knew him?