The last of MGM's "Nick Carter" trilogy, Sky Murder is a tad too cute and clever for its own good, but its mystery angle holds up pretty well. Returning from a weekend party, amateur sleuth Nick Carter (Walter Pidgeon) boards a private plane, where urbane Fifth Columnist Andrew Hendon (Tom Conway) is murdered in a locked compartment. Suspicion immediately falls upon refugee Pat Evans (Kaaren Verne), who was being blackmailed into helping Hendon smuggle secrets to the Nazis. Dividing his time between the land and the air, Carter is eventually able to expose the real murderer, and to smash the Nazi spy ring for good and all (or at least until the next spy movie). The film is hampered by the excessive comedy relief of Carter's self-appointed assistant Bartholomew the Bee Man (Donald Meek), who once upon a time was an amusing character. Far better attuned to the film's framework is perennial dumb blonde Joyce Compton, here cast as deceptively scatterbrained female detective Chris Cross.