For three days now, Mara has not been able to close her eyes because something quietly rustles as soon as the light goes out. Although her mother convinces her that there is no one in the room, Mara is convinced of the complete opposite. But whoever was there, he is a true master of concealment. On the third night, as soon as everyone has fallen asleep, muffled sniffles and sneezes are heard from Mary's closet. What kind of monster is hiding there? But the terrible fear is not only felt by Mara, but also by a small furry monster named Hatchi. However, Mara does not have to be afraid of him because the monster came for one reason only, to satisfy his hunger. But it's not hunger as we know it, because that monster feeds exclusively on socks.