Although the sets and cinematography are scrupulously suggestive of the early 20th century in the United Kingdom and the performances quite good, The Nightcomers never quite gels as a Gothic horror classic. Maybe we see a bit too much of ourselves and don't like to think of the implications of what we're watching.
The children of a wealthy British family are left orphaned by the deaths of their parents in a motor car crash. A cousin who is the closest relation to the father Harry Andrews is at the estate to tidy up affairs, but has no desire to stay there or act as a parent to these two. Never mind, they are amply provided for with cook and governess who are Thora Hird and Stephanie Beacham. The father had a valet played by Marlon Brando and since there is clearly no need for one now he's relegated to the gardener's duties.
Brando's delightful Irish gardener Quint bonds with the kids. He's full of blarney and charm, but that cheerful exterior hides a rather complex and sadistic being. The kids catch him and Beacham in some kind of bondage game as Brando initiates Beacham into the finer points sadomasochistic sex. Both children take careful notes. The kids are played by Christopher Ellis and Verna Harvey.
In the end what happens sets the stage for Henry James's classic Gothic horror tale The Turn Of The Screw. That was brought to the screen ten years earlier as The Innocents which starred Deborah Kerr as the new governess for the kids. According to The Nightcomers, The Innocents would be the last thing anyone would have entitled that film.
Fine performances, wonderful sets and cinematography, yet the film just lacks a spark to consider it a classic. Marlon Brando's fans will want to see it though.