Twelve-year-old Oliver stumbles upon the revelation that his grandfather was once a hunter of monsters and has a shadow creature imprisoned in a hidden cellar. When the creature inadvertently breaks free, Oliver, along with his younger sibling Lasse, must adhere to their grandfather’s guidance and rally their friends to recapture the monster and return it to its confinement—before time runs out! “Monster Busters” draws inspiration from the universe depicted in Jacob Weinreich’s children’s book series.