You Have to Stop This

The final book in the bestselling Secret Series follows Cass, Max-Ernest, and Yo-Yoji as they navigate a dangerous class trip to a natural history museum, which leads them into a mystery involving a priceless mummy and a mysterious Secret. As they uncover clues among pyramids, tombs, and hieroglyphs, the trio faces new threats and challenges, all while the elusive Secret continues to influence their lives. This concluding installment promises an adventurous and suspenseful finale to the series.