The Callender siblings, Lori, Joseph, Ahmed, and Elizabeth, renowned archaeologists and members of the Sleuth Club, are truly... daring kids: they don’t believe what they hear unless they see it with their own eyes, they love puzzles and mysteries, they become stubborn in tough situations, and they never hesitate in the face of danger.

The members of the Sleuth Club welcome their good friend Daisy Fisher, world archery champion, in Cairo. She is accompanied by her father, the famous Professor Fisher, who is studying a nameless mummy… Could it possibly belong to Pharaoh Akhenaten?

While the adults focus on their research, someone disappears briefly along with the mummy, only to reappear later… But Joseph doesn’t believe this mummy is the real one… Will the Callender siblings manage to find it and bring it back intact to Cairo?