hmm what about the sweet valley seris? they come for most ages, their is sweetvalley kids for young kids, sweet valley twins for a little older, sweetvalley high for older still, sweetvalley univarsity for even older, and Elizibeth which only follows one of the twins and her life in europe after she ran away there and ended up a maid lol for a 13 year old I would recomend sweet valley high and up, they have so many is the seris and they have spot light books, and super thrillers etc..