This is the true story of Menie and Monnie and their two little dogs, Nip and Tup. Menie and Monnie are twins, and they live far away in the North, near the very edge. They are five years old. Menie is the boy, and Monnie is the girl. But you cannot tell which is Menie and which is Monnie, -not even if you look ever so hard at their pictures That is because they dress alike. When they are a little way off even their own mother can't always tell. And if she can't, who can? Sometimes the twins almost get mixed up about it themselves. And then it is very hard to know which is Nip and which is Tup, because the little dogs are twins too.