Auzou Book for the investigations of anatole bristol tome 13 plot against cm2

Weird things are happening at school! Anatole's friends are having such bad luck that the young detective starts to think that something's not right... What if the Year 6 students are victims of some tricks? No matter how hard Anatole investigates, he can't figure out who's behind all this... And on top of that, he has to deal with his little sister Maya, who is really getting on his nerves! This investigation is set to be tricky for the best detective in the school…