Les maîtres du suspense (2014) on Netflix

Plot summary

For years the detective novels published under Hubert Wolfe's name have come from the pen of Dany Cabana, a ghostwriter known for his unsociable ways. Wolfe himself has produced nothing in a decade, and the readers who buy the books do not know that the words are not his. When Dany's own life comes apart and his inspiration dries up, he brings in a second ghostwriter, Quentin Wilson, who teaches Dany's son and lives under his mother's control. Wolfe's publisher is waiting for the next novel, Paradise Zombie, and Quentin, gentle and inexperienced, has to write a sex scene for it.