Hieroglyphics: hard to spell and even harder to decode! When a strange message is found hidden on the casket of Pharaoh Raneb, the Museum Mystery Squad must crack a code nobody's seen since ancient Egyptian times. But this mummy's keeping mum. The Squad are not the only ones working on the mystery: they meet Egyptian expert Professor Peter Gyptex, and the very odd Vera Damclot, a fan of mummified cats. Can the Squad reveal the mummy's secret before it unravels?