EXCLUSIVE: Patricia Clarkson has joined the cast of Jonanthan, the Bill Oliver-helmed indie that stars Ansel Elgort as twin brothers with a strange relationship. Clarkson will play Dr. Mina Nariman, their controlling doctor. Production is set to start later this month.

Elgort plays both Jonathan and his twin brother John, who live by a strict set of rules including no lies and no romantic relationships. When Jonathan finds out John has fallen in love with Elena, his ordered life is thrown into chaos. He seeks the help of his doctor and mentor, Dr. Nariman, while also taking matters into his own hands. Oliver co-wrote the script with Peter Nickowitz and Gregory Davis.

Randy Manis and Ricky Tollman are producing and Neal Dodson is exec producing with Jim Reeve and Robert Halmi Jr. The film is produced in association with Oxwich Media and Great Point Media.

Clarkson’s recent films include Learning to Drive and The Maze Runner franchise, and last year she earned a Tony nomination for The Elephant Man on Broadway with Bradley Cooper. She has Sally Potter’s The Party and Isabel Coixet’s The Bookshop upcoming. She is repped by CAA and Anonymous Content.