James McAvoy and Claire Foy will lead the English adaptation of the French thriller ‘My Son’.

French director Christian Carion will direct the adaptation, he also directed the French original, ‘Mon Garçon’ in 2017.

McAvoy will play the father whose son goes missing, leading him to travel to the town where his ex-wife (Foy) lives in search of answers to the mystery.

To play a man who doesn’t know what’s ahead of him, McAvoy will not be given a script or dialogue. Instead, he will improvise on set as each scene unfolds, as was the case in the original French film, with the rest of the cast and crew for the English language remake being aware of the scenes.

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“James will be doing the detective work of the film in real-time, on camera, to create real tension for this thriller. We like to support bold and innovative storytelling like My Son, and Claire could not be a more spectacular or exciting choice for this film which is certain to thrill audiences,” Adam Fogelson, chairman of the STXfilms Motion Picture Group, said in a statement.

McAvoy was last seen in the TV series ‘His Dark Materials’ and ‘IT: Chapter 2’. He is currently attached to the upcoming TV series ‘The Sandman’.

Foy shot to fame playing Elizabeth II in the first 2 seasons of Netflix series ‘The Crown’, she has since gone on to star in ‘The Girl in the Spiders Web’ and ‘First Man’. She will next star in biopic ‘Louis Wain’ opposite Benedict Cumberbatch.