Auzou Advent novel book le mystère de lord noël

"Nathan, Akim, Léo and his sister Léonore are determined to uncover the secret of the creepy manor at the end of the street. The mysterious Lord Noël hates to be disturbed... What could he possibly be hiding? But the dangers are not always where you expect them, and this challenge could lead them into a terrible scheme! The teens are on the case: there's no way they're letting anyone take control of the town and ruin Christmas!"