Unique Features has picked up screen rights to Shiver, the first in a bestselling three-book series of supernatural romance novels by Maggie Stiefvater.

According to Variety, the book covers a bittersweet paranormal romance between a teen who becomes a wolf each winter and his girlfriend, who helps him find the secret to staying human. The first installment was published by Scholastic Press in August and has been on the bestseller lists for six weeks. The sequel novel, "Linger," will be published next August. Unique acquired all three books in the series.

"I'm not the biggest werewolf or vampire fan, but the author has a strong take on a young adult sensibility," Shaye said. "It's also a sexy love story that isn't too over the top."

Shaye and Lynne used their discretionary fund to acquire the book in a competitive bidding situation. They will bring it first to Warner Bros., where they have a first-look deal, and will set a writer shortly.