Not many people know that every house is secretly inhabited by little monsters! These furry creatures take care of a family’s house but cannot be seen. Finnick is a little monster, who doesn’t seem to care about his responsibility of making a home out of the house. But everything changes after a new family comes to his house. When Finn meets 13-year-old Christine, inexplicable events begin to happen in the city and life will never be the same again!

Finnick accidentally loses invisibility, and now the world of brownies is under threat. Together with his man Kristina, he goes in search of a magical magician who will help him regain invisibility.