Los Angeles, 1908. Ex-heiress, Anna Blanc, is precariously employed by the Los Angeles Police Department, reforming delinquent children and minding lady jailbirds. What she really wants is to hunt criminals and be alone with Detective Joe Singer-both no-nos that could get her fired. On a lover's tryst in Griffith Park, Anna and Joe discover the body of a young gambler. Anna can't resist. She's on the case. With a murder to solve and her police matron duties piling up, a young girl shows up at Central Station claiming to have been raped by a man from Mars. The men at the station scoff, but Anna is willing to investigate. Meanwhile, Anna begins getting strange floral arrangements from an unknown admirer. Following the petals leads her to another crime-one close to home. Suddenly pitted against Joe, Anna must examine her loyalties and solve the crimes, even if it means losing the man she loves.