Soulless by Jordan Silver

He’s the man on trial for a gruesome murder, she’s the DA who aims to put him away for life. But in this high stakes case that can end his life and make her career, something even more powerful comes into play.
Vanessa Donahue is a hotshot DA. As the youngest person to ever hold the position in the history of the city, she knows there’s a lot riding on this one, especially if she wants to follow her ambitions to the top.
She has no evidence, just a gut feeling and a seventeen year old puzzle, but she has no doubt she can make it stick.
But when the defendant starts to make even her doubt, she’s not so sure anymore. And after one careless night in his bed she knows the stakes just got higher.