Bulldog Drummond's partner Algy is set to wed. Bulldog attends the wedding but on his return home in the deep foggy night he wanders into an old mansion of Prince Achmed in search of a telephone. To his shock he finds the corpse of an old man. Bodies keep disappearing as Drummond attempts to contact the authorities, including neighbour Captain Nielsen. But a woman is on the case, Lola, who is the daughter of the dead man.
