I’m not going to lie: this is a rather long book. However, it is really, really good. There are enough suspenseful and dangerous situations to keep you on the edge of your seat, and the ending reveals some delightful twists that make you want to read each of the sequels one after the other. The fact that four kids are able to outwit the evil adult as well as his evil teenage henchmen is the icing on an already delicious cake.
Highly recommended for gr. 5-9.