In 1949 Los Angeles, Lily Kessler, a former stenographer and spy for the OSS, is asked by her late fiancé's mother to find out what happened to his sister Kitty, an actress who is missing from her Hollywood boardinghouse. Although the aspiring starlets at the house insist that Kitty is off somewhere furthering her career, her body is found the next day in a ravine below the Hollywood sign. Unimpressed by the local police, Lily investigates on her...