12-year-old Zet has a mystery on his hands: an Egyptian mummy is haunting his doorstep! Can the monster be real or is this some kind of nefarious plot? Zet and his kid sister Kat are determined to find answers, and to stop the mummy from alarming their mother and baby brother. The hunt for clues sends the courageous siblings paddling up and down the Nile on a wild mummy chase. A run-in with the Royal Mummy Maker reveals the strange secrets of mummification. But will it be enough to unwind this puzzling mystery? Only one thing is certain: when their backs are against the wall, Zet and Kat rely on the one thing they know best: each other. Because siblings, they stick together.