Scotland Yard must discover why people are being murdered by a monstrous dog at Blackwood Castle.
Humphrey Connery
Jane Wilson
Douglas Fairbanks
Sir John
Lady Agathy Beverton
Miss Finley
Catharina Wilson
Dorothy Cornick
Anwalt Robert Jackson
Kapitän Wilson
Doc Adams
Lord Beverton
Ken Nelson
Edward Baldwin
Grimsby
Tom Heynes
Edgar Wallace ( Voice )
