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A hooded killer invades the Blackmoor estate, assaulting Lucius Clark and demanding the return of stolen diamonds. The phantom leaves behind a gruesome calling card - the murdered body of a groundskeeper, with the letter "M" marked on his forehead. An inspector arrives from Scotland Yard to catch the strangler and concludes that the murders are the work of a man with nine fingers. Clark's paranoia leads him to accuse his friends and servants. The case is at a standstill when two more disfigured corpses are discovered, but a parcel of hidden love letters provides the investigator with the clue he needs to pick up the trail of the strangler. A violent confrontation with the killer leads to the exposure of false identities and an uncovering of long-buried secrets...
Starring: Karin Dor, Rudolf Fernau, Hans Nielsen, Hans Reiser, Harry Riebauer| Foreign | Uncertain |
| Horror | Uncertain |
| Mystery | Uncertain |
| Crime | Uncertain |
| Thriller | Uncertain |
Video codec: MPEG-4 AVC
Video resolution: 1080p
Original aspect ratio: 1.66:1
TBA
None
Blu-ray Disc
Single disc (1 BD)
Region A (B, C untested)
No review exists for this particular release, however, it exists for the other following regions/countries:
(Still not reliable for this title)

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