When a generous boy shares a cookie with a hungry mouse, it is the beginning of a chain of events that keeps the boy busy all day long, and might keep him busy for days to come. If you give a mouse a cookie, after all, he's bound to ask for a glass of milk, for which he'll certainly need a straw, not to mention a napkin, and a mirror to check for a milk mustache, which will only lead to him noticing that he needs a haircut. This imaginary mouse has the kind of needs a child might have; he needs a nap with a soft pillow, and he needs his drawing hung up on the refrigerator. By the end of a day with such a mouse, a boy-hero might have an idea what it's like to...