"How the Grinch Stole Christmas!" is a children's book written by Dr. Seuss. It tells the story of the Grinch, a creature who lives on Mount Crumpit and despises Christmas. He devises a plan to steal Christmas from the nearby town of Whoville by disguising himself as Santa Claus and taking all the presents, decorations, and food. Despite his efforts, the Grinch learns that Christmas is not just about material things. The Whos in Whoville celebrate joyfully, singing even without their gifts. This realization transforms the Grinch, leading him to return everything he stole and embrace the true spirit of Christmas.