Like many films based on radio plays; the writing tends to forget we also have images to process too and so they run a bit to language. This gentle detective murder-mystery falls into that trap and the wordy dialogue robs the thing of pace somewhat. That said, John Bentley and Dinah Sheridan deliver engaging, cheery performances as they are brought in by Scotland Yard to assist in the search for "Rex" - a mysterious blackmailer/murderer who is preying on women. Features some eerily lit scenes in Canterbury which add significantly to the tenseness of the drama with some hypnotism and fisticuffs at the end.