Toddler William, youngest of four, often causes consternation by disappearing from the bosom of his uproarious family--while they're busy, he wanders off. Even his very first step goes unobserved, taking him out the front door for a tumble down the steps. Like his toy bear, ""Wind him up and off he would go. Nothing stopped him until his energy ran out."" The places where William lands--a store window during a shopping trip, a duck pond near a picnic site, or the dog's basket in the kitchen--are not altogether surprising, but Graham's deft, cartoonlike illustrations (as a draughtsman, this Australian rivals James Stevenson) are full of affection, humor, and a sure grasp of the behavior of a curious, self-possessed toddler.