The Lycan King’s Bride: Paranormal romance books, #16

Wildlife biologist Dr. Ava Monroe enters the forbidden Carpathian wilderness and discovers a hidden Lycan kingdom ruled by the powerful King Ronan Blackthorne. When an ancient prophecy names Ava as his destined bride, she becomes caught between forbidden love, a deadly blood curse, and a rebellion threatening the throne. As the Blood Moon approaches, Ava and Ronan must decide whether their growing love can unite a divided kingdom—or awaken its darkest destiny.