Dr. Arthur Calgary takes a ferry across the Rubicon River to Sunny Point, the home of the Argyle family. A year before, the matriarch of the family was murdered, and a son, Jack, was convicted and sentenced to spend the rest of his life in prison. Throughout the trial Jack had maintained his innocence, claiming he was hitchhiking on the night of the murder and he had been picked up by a middle-aged man in a dark car. Unable to locate this mystery man the police viewed Jack's story as a lie.
Calgary was the stranger in question, but he arrives too late for Jack, who succumbs to pneumonia after serving just six months of his sentence. Feeling a sense of duty to the Argyles, Calgary is surprised when his revelation has a disturbing effect on the family: it means one of the family is a murderer.
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