The Thin Blue Line is the true story of the arrest and conviction of Randall Adams for the murder of a Dallas policeman in 1976. Billed as the first movie mystery to actually solve a murder, the film is credited with overturning the conviction of Randall Dale Adams, who was sentenced to death. The film was the result of a 30-month investigation by Errol Morris. With its use of expressionistic reenactments, interview material and music, this documentary pioneered a new kind of non-fiction filmmaking.