Millionaire industrialist, Walter Willams, has it all, power, money, success and a supposed, idyllic life with his young, beautiful wife, Irene. When a business trip to Denver arises, Walter decides to take his wife along, hoping to turn the scenic ride over the mountains via Lake Tahoe into a mini vacation. However, things begin to go awry when Irene claims she's ill and can't go but insists Walter give a ride to her poor "cousin," who is hitchhiking his way home to Evanston, Illinois. The "cousin" is actually Irene's lover, Jim Torrence, and he is there to carry out his and Irene's plot to murder Walter. But in a twist of fate, after Jim's attack upon Walter, and while Jim is fleeing the scene, he is killed in a head-on collision. Once the bloodied, very shaken, and very bewildered Walter awakens and pieces together what all had happened, he claims amnesia and goes into hiding, with the hope of somehow bringing Irene to justice.

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