When twelve-year-old twins Philippa and John discover that they are descended from a long line of djinn, their mother sends them away to their Uncle Nimrod, who takes them to Cairo where he starts to teach them about their extraordinary powers.

After getting help for their father, who is cursed with rapid aging, twelve-year-old djinn twins John and Philippa and friends travel through the spirit world in search of Faustina, the only one who can keep their mother from becoming the Blue Djinn, and discover a link to museum thefts and hauntings throughout the word.