''Dracula's Daughter'' begins a few moments after ''Dracula'' ends. Count Dracula has just been destroyed by Abraham Van Helsing (Edward Van Sloan). Von Helsing is arrested by two Whitby policemen, Sergeant Wilkes (E. E. Clive) and constable Albert (Billy Bevan). Von Helsing is sent by the Whitby police to Scotland Yard, where he explains to Sir Basil Humphrey (Gilbert Emery) that he indeed did destroy Count Dracula, but because he had already been dead for over 500 years, it cannot be considered murder. Instead of hiring a lawyer, he enlists the aid of a psychiatrist, Dr. Jeffrey Garth (Otto Kruger), who was once one of his star students.