A woman, Roslyn Wright (played by the uncredited Barbara Woodell), is found dead hanging from a chandelier in a posh mansion occupied by Victor Grandison, a popular "true crime" radio story host. Roslyn was his secretary.
Victor has also recently lost a niece, Matilda Frazier, presumed dead from a boating accident. But at a birthday party thrown by another niece, Althea, everyone is surprised by the appearance of Steven Howard, who claims to be married to the missing Matilda.
Victor is accompanied by his radio producer, Jane Moynihan, at the party. He is unsure what to make of the stranger, particularly with a family estate to be settled, and asks a detective named Donovan to investigate. Matilda turns up, but claims to have no memory of Steven or their marriage, despite his efforts to prove it to be true. Acting suspiciously, meanwhile, is Althea's husband Oliver, drinking heavily.
In time, Althea comes to believe her uncle Victor killed his secretary. Victor confirms this to Althea, then murders her as well. Steven confides to Matilda and Jane that he was actually Roslyn's husband, determined to discover the truth about her death. When proof is found as to what really happened, Victor gives a full confession on his final radio show.
Who is Althea's uncle?
Victor