Actress Oona Chaplin, the granddaughter of screen legend Charlie Chapin, is set to feature in a horror movie, Lullaby.

The Alcon Entertainment project is based on the mythological figure Lilith, reported Variety. John R. Leonetti is directing the movie, which follows a new mother who discovers a lullaby in an ancient book and soon regards the song as a blessing. But her world changes into a nightmare when the lullaby awakens the ancient demon Lilith.

“Lilith” also featured in the fantasy TV series Supernatural — currently in its 15th and final season — as a powerful white-eyed demon.

Broderick Johnson and Andrew Kosove are attached as producers. “Lullaby is based on a uniquely original idea that draws inspiration from varied rich and often terrifying mythological accounts,” Johnson and Kosove said.

Oona, who starred in GoT, recently finished the shooting of James Cameron’s Avatar 3, and will reprise her part in Avatar 4 and Avatar 5.