With their film “The Revenant” set to bow this Christmas, New Regency and Leonardo DiCaprio have moved fast to set up their next project together.

Sources tell Variety that Leonardo DiCaprio’s production banner Appian Way has come on as a producer of “The Crowded Room,” an adaptation of the Daniel Keyes nonfiction book that centered around Billy Milligan, the first person to successfully use multiple personality disorder as a legal defense.

Jason Smilovic and Todd Katzberg, who is also a writer on Todd Phillips’ next feature, “Arms and the Dudes,” have been set as scribes.

DiCaprio will produce alongside Jennifer Davisson and Alexandra Milchan.

The pic has been in development for quite some time at New Regency. Story follows Milligan, who was charged in the late ’70s with armed robbery and the rapes of three women on the Ohio State University campus. Milligan, who was diagnosed with multiple personality syndrome, was able to convince the court that it was one of his alternate personalities that committed the crimes and not him.

DiCaprio is repped by LBI Entertainment, and Smilovic and Katzberg are repped by CAA and Madhouse Entertainment. The Hollywood Reporter first reported the news.