When celebrated director Michael Mann announced the launch of his new book imprint on Wednesday, a Heat prequel novel was mentioned as a priority. However, it turns out the first novel from the imprint will be something slightly different. Don Winslow (The Cartel) will pen a novel about real-life mob bosses Tony Accardo and Sam Giancana. Deadline was the first to report the news, after which Winslow confirmed on Twitter.

Accardo and Giancana were two giants of Chicago organized crime in the mid-20th century. Real life stories are not new territory for Winslow. In previous crime novels like The Power of the Dog and The Cartel, Winslow told stories about the ‘war on drugs’ and Mexican cartels using extensive reporting as a resource (he recently used this extensive knowledge to poke holes in Sean Penn’s controversial El Chapo story). According to Deadline, Winslow and Mann have been granted access to previously undisclosed material from the Accardo family on which to base their novel.

They will also reportedly develop the novel into its own film down the line, to be produced and possibly directed by Mann himself. Winslow is currently in the process of finishing his next book, and will delve into this project in late spring.