Paul Temple (author and amateur detective) and wife Steve featured in a number of radio serials written by Francis Durbridge who became famous for his mystery stories and serials with "cliffhanger" endings to the episodes. They started in the 1930s and went on into the 50s and were immensely popular. Many are available on BBC audio publications.
A later TV series starring Francis Matthews as Paul Temple was not written by Francis Durbridge and bore virtually no relation to the radio serial except that they used the characters of Paul and Steve.
This is an early (1948) film version of one of the radio serials with the same name "Send for Paul Temple". Frankly it is not one of the best stories but is a convenient starting point as it is the story where Paul first meets Steve, then a press reporter. Of course, there is little opportunity for cliffhanger breaks though Francis Durbridge co-wrote the screenplay.
The style is very much British black and white 40s B movie. It has been digitally remastered but not restored so there are a few jumps, dubious moments of speech synchronisation etc but these can add to the "feel" of an old film. I doubt it would appeal much to an audience who do not have an affinity for that type of film but who knows?
The 3 stars rating takes into account all the failings but if, like me, you like this genre that will seem a bit mean and I think you will enjoy it.