Some Gave All by Nancy Holder

Detective Catherine Chandler is on a mission to unveil the truth behind her past and discover the secrets surrounding her family. Yet, things become more complicated when she becomes romantically involved with the handsome doctor Vincent Keller, who harbors a dark secret of his own - he turns into a terrifying beast when angered. Together, they struggle to maintain their relationship whilst being pursued by the mysterious organization known as Muirfield.