In April 1960 Sam leaps into the body of a New York City police detective, Tom McBride, who is traveling with his new bride Diane on the Honeymoon Express, the train from New York to Niagara Falls. He soon realizes that Diane's violent ex-husband is stalking her and that he has every intention of murdering them. Meanwhile, Adm. Al Calavicci finds himself before a very skeptical Senate committee reviewing the project's budget. What they don't realize is that Sam's trip on the train and the Senate investigation are definitely linked.