On the 13th of each month, I write about a movie whose title contains the number 13.
Wikipedia, he was an important influence on later pulp characters, as well as on James Bond, but he seems pretty much unknown today (although he may be more popular in the U.K., where the novels originated). 13 Lead Soldiers is one of the later Drummond films, and the second of two to star Tom Conway as the main character. It's a pretty rudimentary murder mystery, with a running time of just 64 minutes and a limited number of characters.
The lead soldiers of the title are antiques from the era of William the Conqueror, two of which are stolen when their owner is murdered at the beginning of the movie. Drummond, a wealthy war veteran and armchair detective, is enlisted by the owner of two more soldiers to find out who is behind the murder. The eventual reveal involves hidden treasure and secret passageways, but it's all treated as very mundane, and Drummond and his sidekick Algy Longworth (John Newland) never get particularly worked up about the crime-solving or the danger they're potentially in.