The wolf's hour.
The Wolf's Hour is a 1989 WWII horror novel by Robert R. McCammon about Michael Gallatin, a British secret agent who is a werewolf, sent on a mission to infiltrate Nazi-occupied France to stop a plan that threatens the D-Day invasion. The book blends historical thriller, espionage, and werewolf fiction, detailing Gallatin's past and his current mission, which involves confronting the German spy who killed his lover. It's known for its blend of historical detail, suspense, and its unique take on the werewolf myth, merging brutality with elegance.