Summer vacation is starting, and soon-to-be-sixth-grader Henry is facing two months with nothing to do. He can sadly feel himself ?being pulled by the gravitational force of nothingness.? His best friend, Max, who may not even be his best friend anymore, is going away to chess camp. And all Henry's stay-at-home father has planned for him and his toddler brother, Sam, is something called a staycation. Things start looking up, however, when he finds out they'll be dog-sitting his grandfather's dog, Rupert. That is, until the day they bring Rupert to the park, where Henry does something...