A witty and fast paced fantasy thriller where a boy aged twelve summons an old snarky djinn. Their adventure starts from the moment djinn arrives and the boy avenges his hurt pride. 
 The novel offers unique world, the author spending time in explaining intricacies of it through the eyes of djinn. 
 Djinn offers explanations to the world of magic and magical creatures via witty and sometimes sarcastic and insulting footnotes which one can ignore if they aren't interested in it. 
 The primary story isn't really unique - save the world, defeat bad people etc. The writing holds up through the book with plot easily moving forward. The characters however don't leave a mark as everything that surrounds them is more fascinating than the character themselves. The main lead could have been changed mid of the book and it wouldn't have mattered. He is smart, cold and aloof but there isn't anything standing out for him. 
 Its engaging enough to know what happens next and that is the only motivation required to delve into the series.