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From the liner notes

Compared favorably to The Blair Witch Project and Paranormal Activity, The Possession of David O'Reilly marks the United Kingdom as the next hot source for original, inventive horror. Giles Alderson stars as David O'Reilly, a guy dumped by his girlfriend and looking to crash with his London friends for the night. Unfortunately, O'Reilly is bringing more than emotional baggage because something—a demon, a ghost, an alien?—is stalking his every move. O'Reilly knows more than he's admitting—why else does he immediately pour a line of salt across the doorstep?—but is he possessed or just nutters?