La Boutique Des Cartes Perdues

This book is the sixth installment in the "Ulysses Moore" series, and while each book presents a self-contained adventure, understanding the overarching mystery and character development benefits from reading the previous volumes.

Kilmore Cove, the primary setting, is a fictional village in Cornwall, England, known for its hidden passages, ancient houses, and a strong sense of mystery that permeates its very architecture, making it a character in itself.