Legacy of Secrets will be produced by DiCaprio's Appian Way and Warner Bros. with his father, George, who brought the book to his son's attention. Earl Katz will serve as executive producer for Appian Way. Warner Bros. is looking towards a target release in 2013 to coincide with the 50th anniversary of President Kennedy's assassination.
The full title of the book is Legacy of Secrecy: The Long Shadow of the JFK Assassination. The book asserts that Mafia godfather Carlos Marcello confessed to Van Laningham to having ordered JFK's assassination. The story will follow Van Laningham during his deep undercover operation in which he becomes confidant to Marcello, who ruled organized crime in Louisiana and most of Texas for decades.