Lily Kessler, a former stenographer and spy for the OSS, comes to Los Angeles to find her late fiance's sister Kitty, an actress who is missing from her Hollywood boardinghouse. The next day, Kitty's body is found in a ravine below the Hollywood sign. Unimpressed by the local police, Lily investigates. As she delves into Kitty's life, Lily encounters an exotic cast of characters, including a homicide detective who might distract her from her quest.