John and Philippa Gaunt, twelve-year-old twins who recently discovered themselves to be descended from a long line of djinn (commonly called genies) and who are now in possession of great powers, have only just returned from their adventures battling evil djinn in Cairo and London. Now the mystery surrounding a powerful book of djinn magic named Solomon's Grimoire lures the twins straight into their next extraordinary adventure.
When the Solomon Grimoire is reported missing, John and Philippa are called upon to retrieve this book of power. They travel across the globe, from New York to Istanbul, Berlin to Budapest, but, little do they know, a trap has been set and the djinn twins are about to walk right into it. Soon, John must embark on an epic journey to save his sister from the fate of eternal hard-heartedness from Ayesha, before it's too late.