In my opinion, I think that the theme is “Good overcomes evil.” Here’s an example:

 “Hey, can one of you guys come give me a hand with this?” I said as manly as I could. Zach looked at me like I was crazy but then the door opened and I pulled one of the guards out by his collar. Shocked and dazed, he didn't even realize what was happening as I knocked him out with one punch and slapped a Napotine patch on his forehead just to be on the safe side.

“Good Overcomes Evil”

Cammie’s teenage life is only as normal as any spies’ life could be.  She was first introduced to the Gallagher Academy when she was only five years old. Since then, she knows every passageway and hole where the security doesn't reach, with the help of her two best friends, Bex and Liz.

Bex is one of Cammie’s best friends who accompanies her on pretty much every one of her missions. She is the first non-American Gallagher Girl in history of the whole school. Most little girls in England grew up wanting to marry a prince. Bex, on the other hand, grew up wanting to kick James Bond’s butt and assume his double-O ranking.

Liz is the most timid one of all the girls. She pretty much couldn't fight at all like Cammie and Bex. But she still had to take the first CoveOps class of the semester. The next semester though, she decided to separate herself from Cammie and Bex to go to Advanced Organic Chemistry, so she could use her genius mind to work in a lab or an office.

I loved this book because I love reading adventure/mystery books. This was one of my favorite parts:

Knowing Bex, she probably would have pointed out a lot of things; but at that very moment, twenty feet ahead of us, we saw a woman in a beige business suit sitting on a bench, talking on a cell phone. There was nothing unusual about her-not her hair, not her face. Except for the fact that fifty minutes before, she had been wearing a jogging suit and pushing a baby stroller.

“Bex,” I said calmly.

“I see her,” Bex replied.