Castle Sinister poster
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Castle Sinister

3.4194849mMovieHorrorThriller

During the War, a British agent travels to the remote Glennye Castle in the wilds of Scotland to investigate a mysterious murder by a masked phantom. Who or what is the phantom? And how are the Germans involved?

DirectorOscar Burn
WriterMary Cathcart Borer
ProducerWilliam Howard Boer

Where to watch

Availability shown for United Kingdom · rights vary by country

Cast · Directed by Oscar Burn

MR
Mara Russell-Tavernan
Gabrielle, Marchioness of Glenye
RE
Robert Essex
Nigel Glenye
KM
Karl Meir
Maj. Martin Selwyn
JL
James Liggat
Capt. Neale (as James Liggatt)
JG
John Gauntley
Michael Glenye
AHAlastair Hunter
Alastair Hunter
McTavish
MO
Maureen O'Moor
Maggie

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Castle Sinister — streaming FAQ

Which OTT platform streams Castle Sinister?

Castle Sinister isn't on any subscription service in United Kingdom right now, but you can rent or buy it on Amazon Video and YouTube. It's not on Netflix.

Is Castle Sinister on Netflix?

No, Castle Sinister is not on Netflix in United Kingdom as of October 2026. You can rent or buy it on Amazon Video and YouTube.

Is Castle Sinister on Amazon Prime Video?

Castle Sinister isn't included with a Prime Video subscription in United Kingdom, but you can rent or buy it on Amazon Video.

Where can I watch Castle Sinister for free?

Castle Sinister isn't available free in United Kingdom; you can only rent or buy it on Amazon Video and YouTube.