Public Enemies is a 2009 American biographical crime drama film directed by Michael Mann, who co-wrote the screenplay with Ronan Bennett and Ann Biderman. It is an adaptation of Bryan Burrough's 2004 non-fiction book Public Enemies: America's Greatest Crime Wave and the Birth of the FBI, 1933–34. Set during the Great Depression, the film chronicles the final years of the notorious bank robber John Dillinger as he is pursued by FBI agent Melvin Purvis, Dillinger's relationship with Billie Frechette, as well as Purvis' pursuit of Dillinger's associates and fellow criminals John "Red" Hamilton, Homer Van Meter, Harry Pierpont, and Baby Face Nelson.