"Camper is happy as a clam and Clam is a happy camper. When you live in The Happy Book, the world is full of daisies and sunshine and friendship cakes . . . until your best friend eats the whole cake and doesn't save you one bite. Moving from happiness to sadness and everything in between, Camper and Clam have a hard time finding their way back to happy. But maybe happy isn't the goal--being a good friend is about supporting each other and feeling...