According to Deadline, John Slattery (Mad Men, Spotlight) has joined the cast of The Rainmaker, a USA Network adaptation of a John Grisham (The Innocent Man, The Last Juror) novel of the same name. Slattery is set to play Leo, a senior partner at the antagonistic Tinley Britt firm.

In the 1997 film adaptation directed by Francis Ford Coppola (The Godfather, Bram Stoker’s Dracula), John Voight (Deliverance, Midnight Cowboy) played Leo. The film currently holds an 81% critic score on Rotten Tomatoes.

The novel’s description on Grisham’s website says that it “tells the story of a young man barely out of law school who finds himself taking on one of the most powerful, corrupt, and ruthless companies in America — and exposing a complex, multibillion-dollar insurance scam. In his final semester of law school Rudy Baylor is required to provide free legal advice to a group of senior citizens, and it is there that he meets his first “clients,” Dot and Buddy Black. Their son, Donny Ray, is dying of leukemia, and their insurance company has flatly refused to pay for his medical treatments. While Rudy is at first skeptical, he soon realizes that the Blacks really have been shockingly mistreated by the huge company, and that he just may have stumbled upon one of the largest insurance frauds anyone’s ever seen — and one of the most lucrative and important cases in the history of civil litigation. The problem is, Rudy’s flat broke, has no job, hasn’t even passed the bar, and is about to go head-to-head with one of the best defense attorneys — and powerful industries — in America.”

The series is set to be written and executive produced by Michael Seitzman (Intelligence, Code Black). Jason Richman (Bad Company, Bangkok Dangerous), who co-wrote the pilot, is also set to executive produce along with Grisham, Jason Blum (The Visit, The Purge) and David Gernert (The Innocent Man).