The Lost Alpha Prince (Book 15 of the Regal Eclipse Pack Series)

Unsure of what happened to him, he's woken up with no memories and has found himself being held captive by a madman who wants his blood. Something is off with him, but he has no idea what. Once he's free, he has no desire to be held captive again, and he'll do whatever's necessary to keep that from happening. But when she comes along, he's not sure if he should take a chance with her when he doesn't even know who he is.