Published in French under the title: Ma vie en smiley: Au secours! ou pas, 2018 by Les Livres du Dragon d'Or.

Max is in trouble, SOS trouble, he's a prisoner in the middle of nowhere. His journal is the conclusive evidence that the next two weeks at summer camp are going to be absolutely miserable... or not! His parents signed him up to give him some "independence," but all it's given him so far is bug bites! It's super hot, he's got no video games, no salt and vinegar chips, and--worst of all--no friends. He even has to pretend to have fun and participate in activities! But despite all that, his roomies are cool, this girl Clara is kinda pretty, and he found a mysterious diary.