 An actor playing Ellery Queen in a motion picture is supposed to be "shot" on camera, then jump up and nab the woman who shot him, exclaiming "Bulletproof vest!" The rehearsal, with blanks, goes fine. But the ensuing "take" with the same gun finds it loaded with real bullets, and the actor drops dead. The film crew tries to carry on, and soon a stunt man is killed when the car he was driving is rigged to wipe out before he was ready. Are the two murders linked -- and how?