Seemingly respectable businessman Earl Brooks tries to lead a normal life with his family - but the problem is his imaginary friend Marshall, who goads him into committing a series of brutal murders. As Brooks tries to wrest control and end the killings, he also has to contend with a blackmailer, who catches him in the act, and a tenacious detective who is close to discovering the truth. Thriller, with Kevin Costner, William Hurt and Demi Moore