George Steele, art curator at a small museum, has an apparent mental breakdown one night, convinced he was in a train wreck...which never happened. In flashback, shortly after proposing to x-ray some old master paintings the museum has on loan, Steele is called on an unplanned nocturnal train trip. He suddenly sees another train ahead, speeding toward his... Is George indeed cracking up, or is there a plot to discredit him? The mystery grows murky with shadowy menace...