In Magic Tree House: Mummies in the Morning, siblings Jack and Annie are whisked away by their magical tree house to ancient Egypt. There, they explore a mysterious pyramid, encounter a ghost cat, and meet Hutepi, the ghost of a queen who has waited a thousand years for help. To set her spirit free, the children must find the Book of the Dead hidden deep within the pyramid's dark, twisting passages. Facing secret chambers, ancient riddles, and spooky mummies, Jack and Annie use courage and cleverness to solve the mystery and help the queen journey to the afterlife.