A spinster and her widowed sister, who are also mystery writers, try to solve mysterious murders.
Ernesta receives phone calls from a man who is supposed to be dead.
After a basketball player is poisoned by an antacid tablet given to him by Gwendolyn, the Snoop sister is accused of attempted murder.
During a murder investigation, the sisters uncover a satanist cult.
A Black Day for Bluebeard is a murder yarn that originated from the Snoop Sisters TV series. Vincent Price guests as a washed-up horror movie star suspected of murdering his wealthy wife.
