Amy and Dan continue their search for the thirty-nine keys. This time, clever clues lead them to hot Egypt. Here, unexpectedly, they discover a long-awaited message from their beloved grandmother and learn that among Grace’s friends were such great people as Howard Carter and Winston Churchill. Overcoming danger, the guys try to uncover the secret of the ancient tomb - and find the next key. Exciting adventures await them in Cairo and Luxor. And also real mummies and crocodiles!