Eighteen-year-old Saoirse Ronan is joining Christina Hendricks and Eva Mendez in How to Catch a Monster, a sci-fi thriller written and directed by actor Ryan Gosling (Drive), who co-produces through his Phantasma Films with Marc Platt Productions and Bold Films.

Described as a modern day fairy tale with elements of “fantasy noir and suspense,” How to Catch a Monster finds Hendricks playing a fetish model and mother of two, who follows one of her sons to a secret under water city. Costars include Matt Smith (“Dr. Who”), Ben Mendelsohn (Dark Knight Rises) and Rob Zabrecky.

Ronan is best known for playing an abducted teen in Peter Jackson’s The Lovely Bones and for her role as a teen assassin in Joe Wright’s Hanna. She’ll next be seen as Gemma Arterton’s vampire daughter in Neil Jordan’s Byzantium and as Melanie Stryder in Andrew Niccol’s adaptation of Stephenie Meyer’s The Host.