It’s a surprisingly good mystery with echoes of "Gaslight." Claudette Colbert finds herself inexplicably on a train, having no memory of how she arrived. Back home with her husband, “Richard” (Don Ameche), she experiences growing bouts of dizziness and confusion, even attempting self-harm. Fortunately, “Bruce” (Robert Cummings) is present to attempt to understand what's going on. The question becomes whether it’s a p…