The Collector

The Collector is a 1965 William Wyler film based on the John Fowles novel by the same name. It stars Terrence Stamp and Samantha Eggar (who has a Star Trek connection).

You can watch it online at this link. Here's a trailer:

The New York Times concludes:

Mr. Wyler has turned in a tempting and frequently startling, bewitching film, but he has failed to make it any more than a low-key chiller that melts in a conventional puddle of warm blood towards the end.

Moria calls it "a mixed success."