This was Monogram Pictures very first Charlie Chan movie, and for a first attempt you expect better. This is basically a "locked room" mystery with the suspects all in a house and Chan is brought in to find the murderer of an inventor. This was in 1944, World War II was still in full swing and the inventor is a sort of Oppenheimer who is in the process of developing bigger and better bombs. Mantan Moreland is there as comic relief and this is his introduction to the Chan series as Birmingham Brown. The movie is just okay. There is inappropriate and somewhat distracting uses of music here (especially in a scene where Chan is seen merely walking around, getting into a cab and then getting out of the cab and walking into the murder scene mansion..why did they need to add driving, suspenseful music here?). There is a typical suspicious looking cast and the solution will seem, as in many Chan movies, far-fetched, but you go into a Chan Movie almost expecting this. Worth watching if you are a fan of the Chan series, if you are not familiar with the Charlie Chan movies, don't be discouraged if this is your first .. there are much better movies in this series.