He's not like he was before. Believe me. I don't know what's happened, but something has. He's changed. He . . . And I'm wondering if . . . To be absolutely honest with you . . . I'm even wondering if . . .

Nicolas, just two years ago a smiling boy, is going through a difficult phase after his parents' divorce. He's listless, skipping classes, lying. He believes moving in with his father and his new family may help. And a different school, a fresh start. When he doesn't feel comfortable there, when he senses he isn't wanted, he decides that going back to his mother's may be the answer. But at some point, options are going to dry up. And then what?

I'm telling you. I don't understand what's happening to me.

Florian Zeller's The Son forms the final part in a trilogy with The Mother and The Father, all of which are translated by Christopher Hampton. The Son premieres at the Kiln Theatre, London, in February 2019.