During a trip to Egypt in the early 1930s, Natascha's grandmother disappears without a trace after a visit to Luxor for a week. She is rescued from the desert, but she cannot remember the week prior. Natascha's plane is stuck in Cairo. She and Walther take advantage of their free time to explore the sights of Luxor and its surroundings. Then, Natascha receives a message from her grandmother's former guide. This volume contains an adventure of both Nataschas, the grandmother's and her granddaughter's.