Some families have reunionsthis one has alibis! In this thrilling 1945 endeavor, Charlie Chan (Sidney Toler) finds himself at odds with an entire family, any one of whom could be a killer! "Helped" by his pseudo-intellectual Number Four Son (Edwin Luke) and his panicky assistant Birmingham Brown (Mantan Moreland), Charlie investigates the recent murder of a brilliant but much-loathed scientist (Frank Reicher) who invented a gas that makes wood as strong as steel. But the investigation is anything but elementary, as Charlie sleuths his way through suspicious scientists, sultry sisters, a silent cousin and a butler with a very stiff upper lip!