Eight-year-old Tomek is having a tough time. His mother is in the hospital, his older brother steals mobile phones, and his father is on the verge of a nervous breakdown. As if that were not enough, a monster has moved to the boy's wardrobe. And not just any monster - a menacing, mysterious and rather greedy one. Tomek has to figure out how to get rid of an unwanted guest before he devours the members of his family or himself. But first, the boy has to prove that the monster is real.