Boy Between Worlds: The Cabinet of Curiosities by Cynthia C. Huijgens
In this action-packed thriller, twelve-year-old Max Mead is headed to Cairo, but there’ll be no time for fun. His grandfather, a famous antiquities expert, has gone missing and his father is frantically organizing a search party. When Max is given the key to his grandfather’s cabinet of curiosities, he hopes to locate clues to his grandfather’s disappearance. Instead, he unlocks an old and powerful family secret and encounters people who will stop at nothing to get their hands on it.