Eduardo, a nine year old boy, has a particular interest in monsters, and Júlia, his younger sister, follows the lead for her big brother. Decided to get involved into this passion of his, Eduardo puts himself to proof, having to face the prejudice of his school mates and even his teacher, for choosing the uncommon future career as a monster's doctor. Now, alongside with his little sister, he'll have to deal with the choice he made, when a real monster comes to him asking for help. Be careful for what you dream of, sometimes it comes knocking at your door.