Proof #1 by Jordyn Redwood (Bloodline #1, Like new, 2012, Pbk, 312 pages, Kregel)

Like new. ISBN 9780825442384

Dr. Lilly Reeves is a young, accomplished ER physician with her whole life ahead of her. But that life instantly changes when she becomes the fifth victim of a serial rapist. Believing it’s the only way to recover her reputation and secure peace for herself, Lilly sets out to find--and punish--her assailant. Sporting a mysterious tattoo and unusually colored eyes, the rapist should be easy to identify. He even leaves what police would consider solid evidence. But when Lilly believes she has found him, DNA testing clears him as a suspect. How can she prove he is guilty if science says he is not?