Cody Banks is an agent with the CIA.
He is also teenager still in high school and trying to learn how to talk to girls and to pass math, all while avoiding bullets and bombs and other nasty things thrown his way.
After attending a summer camp run by the CIA to find talented potential recruits, Banks wants more of the action. He applies for and is accepted into a junior position with the Agency and before he can think he is pulled into a mission. That assignment is to be a teenager, which should come easy, but it also involves becoming friends with a young woman and females are not something Banks knows anything about.
To become successful, Banks is given a crash course in all manner of spycraft and the use of a good number of cool gadgets, some of which he actually learns how to use. Most important for him as well as the mission, though, is how to talk with girls. If his natural shyness and his lack of experience was not enough, the fact that his CIA handler was the gorgeous, sexy, and not so patient Veronica Miles just makes the task all the more difficult.
As if his life was not complicated enough being a junior spy, Banks has the normal teenage problems with his parents, complicated immensely by the fact that he is not allowed to tell them what he is doing (not least because they certainly would not let him do it).
Banks might be a novice in need of training but he is by no means a bumbler or a fool. He is quite intelligent and resourceful and he has a deep drive to succeed that helps him overcome his inexperience. He also has the ability to not take himself too seriously which helps when he makes natural mistakes and must deal with them. Being a teenager, though, often means that adults do not believe or trust him as much as they need to since he is the one in the thick of things.
As the short series progresses, he becomes a lot more confident in his abilities but with his handler changing and the location for this next major mission being so different, his increasing ease in himself is put to a test again.