Stephenie Meyer's 'The Host' Casts Saoirse Ronan

'Hanna' star set to play Melanie Stryder and the alien who invades her mind.

For the die-hard Stephenie Meyer fans out there worried about going into withdrawal after "Breaking Dawn: Part 2" descends upon theaters in November 2012, fear not. The movie adaptation of author's other best-seller, "The Host," has found a star in Saoirse Ronan.

According to Deadline, the film, which was written by Andrew Niccol for independent production company Inferno, will reportedly be looking to find a distributor at the Cannes International Film Festival next week.

Meyer is said to have been heavily involved in the process, and selected writer/director Niccol because she was a fan of his films "Gattaca" and his script for "The Truman Show."

"The Host" is the story of Melanie Stryder, one of the last humans to have avoided capture by an alien race called Souls. The Souls operate more like parasites in that they invade human bodies, fuse to each person's consciousness and erase their personalities. Melanie is eventually implanted by a Soul called Wanderer. Somehow, however, Melanie avoids surrendering her consciousness to Wanderer, who is so overwhelmed by her host's memories and feelings, the alien is driven to reconnect with Melanie's old life. As the two share Melanie's body, they find an underground colony of humans hiding from the Souls.

The 17-year-old Ronan, known for her noteworthy performances in films like "Atonement," "The Lovely Bones" and most recently, "Hanna," will reportedly play both Melanie and Wanderer.

Meyer will be attending the festival to help present the project to prospective buyers.

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