This might be two strikes against it before we start. Firstly it’s Christie, plus it’s a farce, not a mystery. The third strike might be the acting and fourth of two might be underusing Sarah Berger a bit, although the maid partly made up for that.
The ending does have a twist … it would make a jolly nice Sat or Sun evening radio play of old … there are a few of them available if you like this sort of thing. Tweren’t bad.