What's a nice down-to-earth girl from Brooklyn doing in a place like Hollywood?

It's 1964, and Katie Hathaway, almost but not quite twenty-one, has been living in sunny Southern California with her television star aunt and uncle, and their various children and staff, since her parents died ten years earlier. Her uncle is decent, but his wife, the aunt, is a vainglorious pain in the rump. Jealous Aunt Floriana picks a fight with her daughter Clover and causes the girl to flee the house in a hysterical huff. When Clover doesn't return, Katie fears the worst. A day later Clover is found murdered in a crime that doesn't make any initial sense.

On top of all else, Katie works as an assistant to costume designer Eva Zeitoune at Grand Manor Studios. Eva, late of Berlin, left Germany with three colleagues right before the start of the Second World War. As Katie tries to figure out Clover's murder, Eva recognizes the notorious Nazi who tormented her family taking a stroll on Van Nuys Boulevard, and it turns out he's arrived with a scheme for revenge. What exactly are we all living under, Katie wonders - some kind of a Hollywood backlash moon?