William Campbell suffers a massive heart attack and blacks out. He awakens to a large crowd of people trying to help him as he lies in the street. He is confused by the dress and manner of these people, and as he is being examined by the local doctor, comes to the uneasy realization that he has been transported back to 1865. As the reality of this sinks in, he realizes that he has been given a golden opportunity to prevent the assassination of Abraham Lincoln.