You have to stop this (Secret series #5)

Firefly & Fern Summary

In this fifth installment of the Secret series, readers rejoin the adventure as ancient mysteries involving mummies and magical forces come to a thrilling climax. Pseudonymous Bosch weaves together puzzles, humor, and imaginative world-building to create a page-turner that rewards fans of the series with answers while raising new questions. Young readers will enjoy the blend of adventure, clever wordplay, and the sense that anything is possible in this enchanting mystery.