What are the motifs in I'd Tell You I Love You, but Then I'd Have to Kill You by Ally Carter?

A recurring idea in "I'd Tell You I Love You, But Then I'd Have to Kill You" is the contrast between Cammie's spy life and her normal life as her legend. Cammie attends Gallagher Academy as training to become a spy, but when she meets Josh on her first Covert Ops mission, she and her friends investigate him. Then, Cammie proceeds to date Josh, lying and acting like a normal girl and even inventing a whole normal life where her parents are a typical American family like his. During this charade, Cammie realizes that being a spy is easy and being a girl is the difficult part, and she also wonders if every girl on a date is really in deep cover.