Oliver refuses to eat any vegetables but chips. Grandpa has a beautiful vegetable patch, and he makes a bargain with Oliver. Oliver must find the potatoes if he wants chips; otherwise, anything else he finds he must eat without complaining. Each day Oliver finds a new vegetable - carrots, spinach, rhubarb, cabbage, etc - and he learns that he likes them. It is only on the last day of his visit that the potatoes are found underground, and Oliver gets his chips. Spectacular illustrations.