as Horatio 'Boston Blackie' Black / Cyrus Peyton
as Geraldine 'Gerry' Peyton
as Inspector Farraday
as Sgt. Matthews
as The Runt
as Mamie Kirwin
as Attorney Harcourt (uncredited)
as Hack Hagen (uncredited)
as Smiley Slade (uncredited)
as Policeman (uncredited)
as Coroner (uncredited)
as Tenant in Hallway (uncredited)