Charlie Chan is in this mystery about a couple of murders that occur at an opera. There is plenty of atmosphere and some good comic relief from his assistant who is also his son along with a detective who chases him around the building. The best parts of course are the actual opera itself, which was specifically made for this movie, proving that there was actually a time when the Chan series had a budget and could use it well. Also, Boris Karloff shows up in this movie as a red herring, something Lugosi would do a lot during the 1940s.
