Billy is mad about cowboys. He wants to be a cowboy when he grows up. One day, his friend Alf, the milkman, gives him a magic bottle of milk that makes his dreams come true - well, sort of. Billy turns into Cow Boy - part cow, part boy. He can use his tail as a lasso, and squirt milkshake from his pistols. With his new-found cool skills, Billy is a top crime-fighting superhero. Beginner reading books for children who have been learning phonics in school. 'Superhero Secrets' puzzle pages help build comprehension skills.