Reviewed by C.H. (age 9)
I think that the best part was when Zack opened his room door and fell in a pool that was a trap. I liked Zack because he did not know that they had lots of traps and he got caught in some. My favorite character is Zack because he is really funny. I think there is a lot of secret stuff in the book that Zack and his friends have to find out, which makes it suspenseful.
I recommend this book to people that like spies. Kids in second and third grade would like it. There are some funny parts like when he went into his room and fell into a trap. I would award this book four out of five stars.