Donald Sinden usually made sympathetic heroes and amiable gentlemen, but here he is a professional on the other side. With a blacksmith for an aid he breaks into a safe at a cinema, but unfortunately the robbery is jeopardised by an eyewitness and a manager arriving before the job is finished, so he has to be terminated. The rest is the tragedy of the two criminals, one ruthless and the other helpless. They go to the hospital where Muriel Pavlov as the eyewitness is taken in with a concussion after having been knocked down by a bus, running away from the murderer. It's in the hospital all the action takes place, in a wonderful polyphonic hide-and-seek merry-go-round, where Grannie as one of the patients actually is the lead, constantly observing the murderer and never being taken seriously. This is indeed gem of hospital thrillers, and all the characters, odd and serious, add to the splendid show of artfulness in invention - only you as an audience understand and see everything that happens, while all the actors can't understand a thing - until after the film is finished, and you as an audience will have to guess the rest.
