A disabled and traumatised WW2 airman is sent to a convalescent home in Wales, where his mental health gradually degenerates as a result of disturbing hallucinations, and growing suspicions that the doctor in charge may not be as benevolent as he at first seems.
Though billed as being based on The Dennis Wheatley story 'The Haunting of Toby Jugg', the relationship is a highly tenuous one. Unlike the book, this is a psychological drama with no hint of the supernatural, and while the technical quality of the filming is very good, it is very, very slow-paced and, at the end, downright confusing. I can only guess that the film's makers were trying to emulate the ambiguous nature of 'The Turn of the Screw', but this is not in the same class at all.
If you liked the book, I can't recommend it. As a psychological chiller it certainly has some unsettling moments, but on the whole it is far too slow and uninvolving.