After Sam moves in with his cousin Matthew's family, he agrees to an initiation into Matthew's group of friends. Matthew and his friends just want Sam to leave them alone so they come up with a task he surely won't complete: wear a girl's uniform for the entire first week of school. To everyone's surprise, Sam goes along with it and convinces all the teachers and students that he is a girl.
I was afraid the author would be trying to make some kind of overt point about gender identity or sexuality, but this was just an amusing story that could easily be turned into a Disney Channel or ABC Family movie. The story is told in brief sections by the main and minor characters (but interestingly, never Sam's point of view), so the plot moves along quickly and would appeal to reluctant readers. More mature readers may want to discuss the ethical implications of Sam's charade.