Lost in Boyland
Carson Gallagher and her sister Sage thought they understood boys, until they decided to become them. When Sage suspects her boyfriend of cheating on her she comes up with a completely brilliant plan- the girls are going to turn themselves into boys and follow Sage's boyfriend to a summer program in New York to spy on him, and of course gather research on the male species. With help from their brother Nathan who is also attending the program they turn themselves into guys and set off for New York. Unfortunately they find out that having a roommate that is a total Sex God, having to live in a dorm with a bunch of guys, trying to conceal the fact that they are really girls and spying on a boyfriend who can't know you're really there is a lot harder than they thought it would be. Being a girl is hard enough, try pretending to be a boy.