The Homecoming dance is just around the corner and the only thing the twins have on their minds are boys. The only problem is they have no idea what actually makes boys tick. Susan decides that Christine should dress up as a boy and find out what boys really think and do when girls aren't around. So Christine invents "Charlie Pratt", and says that he is the girls' cousin who is visiting the Pratt twins and going to school with Susan while Christine is out sick. This is a hilarious book that is timeless in its theme. Any young child would love Susan and Christine's adventure in what exactly drives boys.