The film actually takes some liberties with Mary Shelley's source novel. But it perfectly captures its sense of Gothic tragedy, creeping fear and general strangeness - which for me the Kenneth Branagh 1990s version never quite managed, despite being more faithful to the original text.
This one is quite lavish for its TV movie origins and with a very literate script by Christopher Isherwood. Good, unfussy direction by the underrrated Jack Smight, too. The performances are excellent, very restrained in contrast to the 'mad scientist' excesses of the 1930s Universal efforts. James Whale's original is probably a better, more striking film but this is undoubtedly the best adaptation of the book. You'll need an all-regions DVD to play it but it's worth it.