Madeline and the Bad Hat

The story begins when the Spanish Ambassador and his wife move in next door and their son, Pepito, is not a good boy. Madeline dubs him a 'bad hat' and the book is controversial due to the cruel nature of Pepito's mischief, notably animal cruelty and pulling various pranks.[1] After he suffers from his own actions involving a group of dogs and a cat, Pepito reforms himself while bandaged up in bed and Madeline visits him. Pepito is also a main character in the stories Madeline and the Gypsies and Madeline in London, but in the TV series, he has three cousins named Paquito, Pablito and Panchito who are much worse than he himself was.