This is a very poor comedy mystery, starring Hy (short for "Hyacinth") Hazell and Michael Medwin as a pair of cabaret entertainers who get mixed up in a sinister plot when Andrew Keir walks into the club and asks Miss Hazell to model for a picture of Anne Boylen. It's based on a BBC radio serial, created by Edward Mason, who also helped devise "Dick Barton", "What the Butler Saw" and the never-ending "The Archers". All but the last were filmized by Hammer about this time.
The performances are big and hysterical, casting no glory on the leads, despite the fact they were all capable performers. This one is definitely a quota quickie and no better than it ought to be. Unless you wish to see good performers when they were younger and much worse, this is one you can avoid.