A great start to a fun series. Though I'm older than the target audience, I really enjoyed the playful story that has come out of E O'hely's imagination. The PEP Squad school is one I would have wanted to attend immediately when I was a teen (and still do as an adult).
The author brilliantly rendered such experiences as skydiving, absailing and code breaking, i felt like I was back in my own experiences of that! And the main characters are strong, female and malerole models, who are unashamed of being smart, which I love.
The one thing I was a little disappointed about was how long it took the main character, Jess, to pull herself and her skills together in the climax. In saying that the author did show the character's surprise at the praise people gave her during the novel, with Jess, like many young girls, focusing on the things she couldn't do. So maybe it was a hidden message from the author about finally believing in yourself :)
In any case, highly recommend this book and the series in general.