"Forbidden Cargo" is a very good crime film. However, it is vastly different from an American crime movie of the era...much of it because instead of action and snappy dialog, this one seems very staid and subdued. This is NOT a complaint. While some of the camerawork is actually reminiscent of film noir, the overall style and energy level are not.
The heroes of this film are not police but members of the Inland Revenue...the British version of the Customs Department. It begins with some very audacious criminals bringing in contraband while using British Navy uniforms and a duck (an amphibious boat). After cracking that case, one of the men captured for this crime mentions that he would like to have his case dropped IF he tells them about a shipment of drugs about to come into the UK. However, before any deal can be made, this man is murdered...and the Inland Revenue sends an undercover agent to France to follow what few leads they have.
As I mentioned before, this really isn't a typical action film....but it is very good when it comes to realism and excitement. For fans of crime flicks, this is one well worth your time.