John Gilling directs this horror starring Barbara Shelley in which a cat sets out to avenge the murder of its owner. When wealthy elderly woman Ella Venable (Catherine Lacey) is reported missing the police and a number of relatives, including her concerned niece Elizabeth (Shelley), arrive at her stately house to investigate. Unfortunately for them, only Ella's cat, Tabitha, knows the truth - that Ella was murdered for her fortune by her husband (André Morell) with the aid of two servants. However, Tabitha sets out to bring justice to the murderers in her own way. Can she use her feline wits to get the better of them?