Known for her role in White Bird, Ariella Glaser has been cast to star in Flavia alongside Martin Freeman. The movie will center on an 11-year-old detective.

Glaser will portray the protagonist’s sister, Ophelia de Luce. Molly Belle Wright, known for Free Spirit and Mistletoe Ranch, will play the titular character, Flavia de Luce.

Flavia is based on New York Times bestselling author Alan Bradley’s book series, which follows the young detective. The story revolves around Flavia, who discovers a dead body at her British manor house. When her father is accused of committing the murder, she takes it upon herself to investigate. Her search for the truth uncovers a web of secrets and leads her face-to-face with the killer.

The film is directed by Bharat Nalluri and written by Susan Coyne, known for Daisy Jones & The Six. Together, they bring the 11-year-old detective’s story to life.

The detective mystery has been sold to Sky in the UK and various distributors across Europe. Protagonist Pictures will handle distribution.

Glaser is the latest star to join the production. She had her breakthrough role in Anya Taylor-Joy’s Amazon film Radioactive. Recently, she starred in Marc Forster’s war movie White Bird, which serves as a sequel to 2017’s Wonder.

Glaser is represented by Jess Alford at United Agents and Pinnacle PR.