This book is one of my favorites in the Secret series. Cass's mother's disappearance right after the two really connected was sad, but the kids' tenacity and dedication to stop Señor Hugo was really exciting to read. The irony of Max-Ernest's chocolate allergy in a book filled with chocolate was funny to read and I actually learned a lot about chocolate in the book! I liked Yo-Yoji's character more in this book and the setting was both magical and also funny with it ending up in such a mundane location compared to what they had initially believed. This book maintains the silly energy of the first two books while still allowing the characters to grow up a bit, which I really enjoyed.