At first, there doesn't seem to be much to the plot or depth of the story but like most of Anthony Browne's books, you will find something new every time you look at it that you haven't noticed before.
The story is about two siblings with gender stereotypical personalities and their attempt to resolve their differences by their mother's insistence. Their relation with one another change through a series of strange events.
Clearly inspired by well known fairy tales,the illustrations are dark and rich in symbolism. The sequence of events from the climatic point of the story also reminded me of a famous Hans Andersen story but I shall not reveal it here for those who wish to read this gem of a book.
Like all of Anthony Browne's books, the value is in looking over it again and discussing its deeper meaning and empathy with its characters.