Oliver’s grandfather claims to be a Monster Buster but Oliver doesn’t believe in monsters. Until one day when his parents starts behaving very odd. Oliver and his horror-loving little brother discover that it’s the dreaded Shadow Monster that haunts. The Shadow Monster spreads from person to person through kissing and leaves its victims with their personality fully changed. As the danger becomes clear to the grandfather, he reveals that Oliver is chosen to become the next great monster buster. But Oliver hasn’t got the courage to save the city from the crazy shadow monster. Particularly since he is already busy escaping from the bully Philip while trying to make an impression on the beautiful Luna. Soon Oliver realises that he has no choice; he has to catch the monster before it catches him.