Dr Seuss Cat in the Hat US Exclusive Mini BackpackThe Cat in the Hat is a book where an eccentric hat wearing cat visits two children, Sally and Sam, who are home alone and having a very dull day. Their mother is out, and when the Cat comes in, he reassures the kids that their mother won't mind him or his tricks! The book was met with immediate success and has become one of the best selling children's books of all time, making the Cat in the Hat Dr. Seuss' signature creation.