I'm giving the series 5 stars because it was such an enjoyable read and adding it to a shelf for my son to read when he is old enough. The first book had me filled with wonder--what a fun imagination Mull has! This book had more violence than the previous two (or maybe more realistic violence) and a couple times the books had me thinking are these really 13 year olds? But overall it was a great finish to a great series.