When Lily Larson walks through the door of the Coffin and Pate Detective Agency, twelve-year-old Henry Coffin"s heart skips a beat Is this gorgeous girl who keeps crying "I"ve lost ... I"ve lost ..." going to be his father"s next client? It"s like a dream come true -- until Henry learns that what Lily thinks she has lost is her mother ... and for the fourth time!But Lilys mother really has disappeared, and while Mr. Coffin is away on business, Henry suddenly finds himself riding around L.A. in Lilys big red car, tracking down clues they hope will lead them to Lily"s mother.Unfortunately, only Lily"s mother knows that following those clues may also lead them to their deaths.