Broadway producer Peter Denver (Van Heflin) takes in young actress Nanny Ordway (Peggy Ann Garner) while his wife (Gene Tierney) is out of town. When Nancy is found murdered in his penthouse apartment, the two prime suspects are Peter and the neglected husband (Reginald Gardiner) of temperamental Broadway star Ginger Rogers, who had also been dallying with the dead girl. Detective Bruce (George Raft) figures out the true identity of the killer, but the audience may be well ahead of him. Despite its resplendant color photography, Black Widow is a "film noir" at heart.