Why would Hollywood soap opera star Ava Eveready check into a decrepit inn like Henry Cabot's lodge on a stormy night when the phone lines are down and the only road to town will soon wash out? Because her calculating husband Robert planned it that way so he could poison her. Also along for the ride are Ava's secretary with whom Robert is involved, and Ava's identical twin sister, Eva. But everything about Robert's well-rehearsed plan goes wrong. And bumbling Sheriff J. T. Malden, Cabot's good buddy, is right there to confuse the plot even more when he falls for the sweet twin, Eva. By morning one of the twins is dead. Is Eva really Ava, or is Ava really Eva, or still Ava? One actress plays the roles of both sisters.