The Day of the Djinn Warriors is the fourth installment of the Children of the Lamp series. The author, Philip Kerr, has said on his website that he is planning to write a total of six books although he hasn’t decided what the titles of the remaining books will be.
Djinn twins John and Philippa are off on another whirlwind adventure that takes them around the globe and into unknown worlds. And it’s a race against time as they attempt to rescue their mother from her fate as the Blue Djinn of Babylon. An aging curse has been placed on their father, and if the twins are gone too long, he’ll rapidly become an old man. Meanwhile, museums all over the world are reporting robberies of valuable jade from their collections, as well as bizarre hauntings.