Scotland Yard must discover why people are being murdered by a monstrous dog at Blackwood Castle.
Heinz Drache
as Humphrey Connery
Ilse Pagé
as Miss Finley
Mady Rahl
as Catharina Wilson
Otto Stern
as Kapitän Wilson
Horst Tappert
as Douglas Fairbanks
Tilo von Berlepsch
as Lord Beverton
Agnes Windeck
as Lady Agathy Beverton
Karin Baal
as Jane Wilson
Hans Söhnker
as Anwalt Robert Jackson
Uta Levka
as Dorothy Cornick
Alexander Engel
as Doc Adams
Siegfried Schürenberg
as Sir John