The bestselling sci-fi novel follows Melanie and Wanderer, the extraterrestrial “soul” that has taken over her brain, as they experience a sort of paranormal Stockholm Syndrome. Ronan would play both roles, or more specifically, a role within a role, a daunting task that I’m sure the Oscar-nominated actress is more than up to. The film’s producers may be looking to make the character a bit younger: In the book, Melanie is 20 years old, while Ronan is 17.
Saoirse Ronan, most recently seen kicking ass to techno music in Hanna, is set to be invaded. Ronan has been cast as Melanie, a young woman whose mind is besieged by a parasitic alien, in the film adaptation of The Host – a.k.a. that one Stephenie Meyer book that doesn’t involve pouty vampires.