The Blue Djinn of Babylon

John and Philippa Gaunt, twelve-year-old twins who have recently
discovered that they are descended from a long line of Djinn and
in possession of magical powers, continue their extraordinary
adventures in this sequel to The Akhenaten Adventure. When the
powerful book of Djinn magic goes missing, John and Philippa
are called upon to return. Only the book isn’t really missing. The
trap was set and Philippa is abducted by the Djinn. In this latest
instalment in the twin’s magical adventures, John and his uncle
must find Philippa before it’s too late.