Juggling school, studying and being a spy was something that Patricia had to do on a daily basis. That definitely doesn't make her your ordinary teenager. Whilst on the search for the thief of the missing diamond which was stolen from her local museum, she keeps bumping into a mysterious stranger who she knows nothing about yet he knows a lot about her and starts to wonder if these meetings are purely a coincidence or if he is really stalking her! As she is growing older, she realises that being a teenage spy isn't as easy as she thought it would be. She's discovering she can't have the best of both worlds and will eventually have to choose one life to lead.

(semi-long hiatus) Serena Valentine successfully completed her mission as an undercover student at Summington High school. But in the spy world, there are no happy endings. Instead, questions from the last mission were left unanswered, and Serena is determined to find them. When the Valentine team is assigned a second mission, it is not like anything Serena expects. More questions are added onto the list, making it even more confusing for her to handle. Rules might be bent, and risks will be taken.

Serena Valentine isn't your average sixteen-year old girl. She's determined, stubborn, and decisive. She also happens to be an agent of the ICI; a spy commission only the government knows about. When Serena is assigned her first mission, it's the opposite from what she was expecting. Serena must go undercover as a high school student at the school of Summington. She'll have to deal with her team, the craziness of high school, and the real definition of spy. High school was not anything Serena was expecting. But when you're a spy, you have to be ready for anything.