This trilogy by Jonathan Stroud consists of The Amulet of Samarkand, The Golem's Eye and Ptolemy's Gate. They chronicle the adventures of a talented young magician called Nathaniel and the witty Djinni Bartimaeus whom Natahaniel has, just, managed to control. The books are set in a magical version of London run by magicians and travels a little to other countries. The other main character who features is Kitty, part of a resistance movement working against the rule of the magicians. Along with the human inhabitants are a suitable number and variety of creatures from the tiny and snivelling ??? to the living clay monster Golems.
I found the first of these book, The Amulet of Samarkand, while looking for something less vacuous than Harry Potter. This trilogy falls into the category of children's fiction also, which sits nicely with my attention span. I waited anxiously for the second and found it well worth the wait - not a copy of the first with different monsters as the Harry Potter series has been so far.