Jordan and Hammond Barker are reluctant to help but when the police finally make an arrest, another murder occurs in a seedy Soho jazz café.

Its success is due to its good script, the unusually agreeable characterisation of the two investigators, a nice vein of humour (some of the best lines are almost thrown away, so inconsequentially are they delivered), the contrast provided by the Inspector's domestic life (not overdone as is so often the case), and a generally high level of acting.

Who did it is kept in sprightly abeyance ... Patrick Campbell and Vivienne Knight wrote the script, which embraces a scrubby queer club and a copper who digs opera.

"[5] Variety called the film “A crisp, well made whodunit, with plenty red herrings to keep an audience guessing.

At times it seems as if every known vice has been woven into the labyrinthine plot, which centres on the efforts of cop lan Hendry to prise clues to the identity of a model's killer out of her friends and family.