Newcomer Jemima West has landed the role of Isabelle Lightwood in “The Mortal Instruments”, the novel’s author Cassandra Clare took to Tumblr to report. She will join Lily Collins and Jamie Campbell-Bower in the Harald Zwart-directed adaptation of the first novel in a series that’s Screen Gems’ answer to “the next Twilight/Hunger Games.”

Collins will play the lead character, 15-year old Clary Fray, who discovers that she can see supernatural beings that no one else can and gets drawn into the world of the Shadowhunters, humans who hunt and kill demons. Of course, there is a boy for Clary to fall in love with, and his name is Jace Wayland, an arrogant Shadowhunter. West’s Isabelle is a fellow Shadowhunter who is beautiful, strong and defiant. Her brother, Alec, has reportedly been cast as well, though Clare would only confirm he’s British and is not: Nicholas Hoult, Ben Barnes or Douglas Booth. Let the speculation begin!

Paris-born West has appeared on numerous French TV shows, including “Maison close”, but is probably most known to American audiences for her recently completed role as Vittoria on season 2 of Showtime series “The Borgias.”