June, 1951. It's a tense summer in the City of Angels. A killer is on the loose. She's blonde, she's beautiful, and she murders bad guys. On three different occasions, she thwarted a mugging in progress, saving the innocent, dispatching the guilty, and fading away like a whisper in the rain. She never waits around for thanks. Apparently, she doesn't want any.

Who is this woman?

Jack Curran, star reporter, is determined to find out. He's a good citizen. A war hero. A journalist who wants to write fiction, which he plans to once he files an exclusive on Thrill Girl's identity. When Thrill Girl strikes a fourth time, adding two more to her body count while saving a pretty shop girl, his investigation leads him to socialite Alana Maxwell. She's blonde. She's beautiful.

Does she murder bad guys?

Despite his publisher's warning to be wary of her very connected and powerful step-brother, Jack goes to ask her, face-to-face. But Alana Maxwell doesn't care that a newspaperman is tracking her like a hound with a snout full of fox. She has only one thing on her mind: saving her younger brother's life. It's something she'll do anything to accomplish. Anything. Including taking illicit drugs, living with blackouts and hallucinations, and putting herself in the hands of a mysterious doctor she has no good reason to trust.

Before Jack can nail down Alana's connection to Thrill Girl, LA is rocked by an even more lurid crime. A bum is ripped to pieces near the Griffith Park Zoo. The coroner says the bite marks have traces of human and animal saliva. The cops go crazy. Jack's newspaper proclaims a monster's in town. The good citizens of LA lock their doors and windows and clamor for answers.

Jack is determined to provide them. He hears a rumor about something called a der Katzenjunge. Translation? A European myth about men with the mutant ability to temporarily transmogrify into a savage, feline-like creature.

What the hell?