The sinister Count Oetsch scandalizes the aristocratic social gathering at Castle Vogelod as he announces his intention to "crash" the festivities. Baroness Safferstätt is expected shortly, and the guests are well-aware of the rumors that Count Oetsch murdered the baroness' late husband. Oetsch refuses to leave, vowing that he will reveal the identity of the real killer. Before the weekend is through, the Count and Baroness will reveal secrets too shocking to be believed!

The beautiful Evelyne Schratt, who has many admirerers, and whose two husbands both died under mysterious circumstances, is giving a reception. When one of her admirers is found stabbed to death in a room upstairs, the police detains everyone in the house and begins an interrogation (oh goody: does dinner come with this mystery theatre, too?). Evelyne admits, that the murdered man tried to blackmail about some information he had about the death of the two husbands.