 In October 1974 rural Grove's Mill, Minnesota, widow Mare Blackburn's (Kate Jackson) 3-year-old son Luke (Ross Swanson) is kidnapped by an unknown woman when Mare briefly relaxes her supervision of Luke in the small town's supermarket.Mare blames herself for the kidnapping and has difficulty processing the loss.Sixteen years later, Mare is now in a happy long-distance relationship with Dan (Chris Sarandon) – a California man who moved to Minneapolis after the suicide of his son - when a young man named Mark (Rick Schroder) shows up, claiming to be her son.