finds Honolulu-based detective Charlie Chan (Sidney Toler) arriving in the Big Apple for a policeman's convention. No sooner has he arrived than Charlie is up to his neck in a murder mystery. This time the killing is tied in with a gang of enemy saboteurs, bent upon scuttling the test flight of a revolutionary new bomber plane. With the "help" of willing but inept Number Two Son (Victor Sen Yung), Charlie wades through a sea of suspects to finger the genuine killer. Among the film's highlights is a very funny "line-up" bit by an uncredited Shemp Howard; its low point is a lamentable stretch of racist humor involving black actor Clarence Muse.