I love the Chan series but it takes an element of disbelief. You have to either accept (or ignore) the fact that Charlie never seems to spend much time in Hawaii (making one wonder what the Honolulu PD actually pays him to do) and much like Philo Vance or Nick Charles, has some sort-of official status everywhere he goes. And if you watch enough of these, you begin to see the same Fox contract players popping up over and over again as red herrings, jilted lovers and "adventuresses." This '40 entry has Charlie coincidentally meeting up with an old friend (bad omen--- his friends have a shorter life expectancy than the doomed red shirted yeomen beamed down in Star Trek episodes) Scotland Yard on a plane en route to a police convention. Charlie enlists himself in solving his friend's murder and by default, the case he was working on. No. 2 son Jimmy Chan (played by 25-year old Victor Sen Yung) seems to exist to state obvious inane comments or offer wildly improbable facts--- most notably identifying a new poison gas by smell (he must be a whizz undergrad back in California). Watch for Shemp Howard as a phony Hindu in a line up and future Captain Marvel Frank Coghlan Jr. in a bit part as a coat room clerk in a men's club. This is a fair entry but suffers somewhat from the lack of an exotic setting (Paris, Berlin... Reno!) or the occasional supernatural elements found in several of the others (...Egypt, ...Secret, Castle in the Desert). It's one of the most straight forward whodunits of the entire Fox films.