A slow-moving but engaging adventure story with Richard Greene as an FBI agent on the trail of a gang dealing in smuggling and counterfeit currency, responsible for the murder of his brother, and finding romance with a chanteuse, Anouk Aimee. The unusual backgrounds and colour photography, as well as avoidance in casting the usual suspects as villains, help mark this co-feature out from similar British crime films of the time. Not so the convention of the hero having to be an American and Richard Greene's accent fluctuates with every other line. In every other respect though Greene, who was to start his long-running stint as Robin Hood shortly after finishing this picture, makes an admirable hero, having something of the easy-going charm of Roger Moore.