Agatha Christie was a top-drawer playwright as well as a novelist, and this film is based on her successful comedy thriller 'Spider's Web' (there was no 'The' in the original title). It had a successful run in London in 1954-56 and starred the wonderful Margaret Lockwood, who also starred in a 1955 TV movie versiion (which I've never seen, alas).
In this very plush technicolor adaptation, Glynis Johns steps into Lockwood's shoes, and does a creditable job. It's a high-energy role, and she overplays her part just a bit. This was probably at the urging of director Godfrey Grayson, a competent director of crime movies who perhaps found himself in unfamiliar comedy territory. In fact, Godfrey's uninspired direction is probably why the film starts to plod about halfway through, and never really recovers.
For the complicated plot, Christie may have borrowed an idea or two from Jack Trevor Story's novel The Trouble With Harry, which of course was the foundation for Hitchcock's classic 1955 movie. The Spider's Web is no classic, however, and probably won't stick in your memory. But it makes for OK viewing, with some laughs and a few thrills. The acting all around is commendable, and, best of all, the sets are gorgeous and definitely worth a peek.
