A Scotland Yard Detective must investigate a series of murders perpetrated by a giant blood-sucking moth that can take human form.
Detective Inspector Quennell
Dr. Carl Mallinger
Clare Mallinger
Sgt. Allan
Granger the Butler
Meg Quennell
William Warrender
Morgue Attendant
Frederick Britewell
Clem Withers
Landlord
Mr. Warrender
Coachman Joe Trager
Student with Toy Spider
Constable Smith
Chief Constable
James
2nd Porter
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