It's Mississippi, the summer of 1970, and two children are determined to build the ultimate treehouse with their friends, while their father, a newly returned Vietnam vet, has equally high hopes to rebuild his life.

Dr. Jack Gramm is a college professor who moonlights as a forensic psychiatrist for the FBI. Gramm receives a death threat claiming he has only 88 minutes to live. Now he has to put together the clues and try and solve the biggest crime of his career. He narrows down the possible suspects, who include a disgruntled student, a jilted former lover, and a serial killer who is already on death row, all before his time runs out.