Every summer, Paul and Barbara Roberts take their children out to the country, where they spend peaceful time together at the edge of the lake. Their four kids love the place they call "The Cottage." They love each other, too, even as each child begins to grow and develop new interests and new friends-each child except Peter, who is different than the others. Peter has Down's syndrome. He doesn't look like the other Roberts kids, and he doesn't act like them, either. This can be hard to understand, especially for other kids Peter's age. Even so, Peter is often filled with joy; the simplicity...