i dont have 1 fave book..i love the seires.. or whateveer it is spelled..

The Bartimaeus Trilogy
Book 1. The amulet of Samarkand
Book 2. The Golems Eye
Book 3. (Has not been released yet)

All time fave..if somone is interested in it it is by Jonathan Stroud... kinda based on harry potter.. but the main dude in this one can piss all over harry otter and harry cant do shit