The Evil Dead director is collaborating on a screenplay with his brother Ted for a film that will see him make his first directorial outing in the genre since 2009's Drag Me to Hell.
"It's a very simple story about a character," Raimi told Shock Till You Drop. "We're trying to figure out what they want.
"It's all of the basic stuff - how they come involved with this darker force. There's nothing much to tell [yet]. I've got a three-page treatment we're working off of right now."
Raimi served as producer on Ole Bornedal's forthcoming horror The Possession. An exclusive clip from the movie debuted on Digital Spy today (August 29).
The Possession opens in cinemas on Friday, August 31.
Watch a trailer for The Possession below: