Mystery and adventure for four young detectives in Ancient Roman times . . .
When the friends are shipwrecked, Nubia is lost and Flavia, Jonathan and Lupus set out on a desperate quest to find her. A trail of codes and riddles leads them from the port of Alexandria to the Great Pyramid, and then on a dangerous journey down the river Nile.
Amid temples and tombs, hippos and crocodiles, will the detectives ever find their friend?