Leonardo DiCaprio and Martin Scorsese are back at it again with a new film, Variety reportsThe movie will be an adaption of the true-crime thriller Killers of the Flower Moon: The Osage Murders and the Birth of the FBI by David Grann, who is also the author of The Lost City of Z.

The true story, which is set in the 1920s, follows the murders of people belonging to the Osage Nation in Oklahoma following the discovery of oil in the area. The book was published earlier this year, and rights to it were reportedly purchased for a cool $5 million. The script is reportedly being written by Eric Roth, who has worked on the screenplays for Forrest Gump and The Curious Case of Benjamin Button.

Scorsese and DiCaprio have worked together on a lot of movies—five in total (Gangs of New York, The Aviator, The Departed, Shutter Island, and The Wolf of Wall Street). They also teamed up on the 2015 short film The Audition, which has yet to receive a release date. 

The new film is still in the early stages, so there is no word yet on when it will be released. Shooting is expected to begin next spring.