James McAvoy and Claire Foy are set to star in STX's English-language remake of the French thriller My Son, but the actors won't quite be on equal footing, as McAvoy will be in the dark, so to speak. McAvoy will play a man whose only son goes missing, so he goes to visit his ex-wife (Foy) in search of answers. To enhance the protagonist's mysterious and confusing circumstances, McAvoy will not be given a script or any dialogue, as was the case in the original 2017 French film starring Guillaume Canet. Instead, McAvoy will only …