The story follows the mystical Russian who was embraced by the Imperial Family as a medical adviser for their hemophiliac son Tsarevich Alexei. Rasputin continued to gain considerable influence with the family, so much so that the family's rivals tried to kill Rasputin several times before his eventual death in 1916. There have been movies made about this historical figure before, but writer Jason Dean Hall reportedly unearthed new details about the man, which give him more "psychological depth."
Leonardo DiCaprio can currently be seen in The Great Gatsby, and has The Wolf of Wall Street opening this fall. Jason Dean Hall wrote Spread, the upcoming thriller Paranoia, and the adaptation American Sniper, which Bradley Cooper is starring in for director David O. Russell.