Ten-year-old Willem has always dreamed of becoming a superhero and fighting crime alongside his father, who is a police officer. However, his dream is shattered when his little brother Charlie is born. Not only does Charlie get all the attention, but Willem also discovers that Charlie has superpowers. When a supervillain and a mad scientist put their evil plan into action, Willem and Charlie must put their differences aside and work together as a team. But can a baby and his jealous brother save the city? Based on the popular books by Camila Läckberg.