Richard Tracy is a retired detective who is riding the Texas MS 150 because his adult children have talked him into doing it. While riding in this charity bike ride, he meets Mary Beth, a charming blond Texan. Sparks fly. They agree to correspond with the goal of eventual marriage, but as they finish the ride, they are caught in an explosion. Richard is wounded and wakes up in a hospital. Mary Beth is uninjured. but has disappeared. Richard must find her. Mary Beth has been abducted by a group of mental patients who think it is still 1969. They believe they are still in Southeast Asia fighting the Vietnam War. They have mistaken the MS 150 bike riders for a bicycle convoy headed north on the Ho Chi Min Trail for another load of supplies. In the aftermath of their attack on what they believe to be a convoy, Mary Beth is recognized as the sergeant's wife. They have "rescued" her and are taking her with them as they move eastward toward US troops. Richard must risk his life to free the woman he loves.