The witch Scylla decided the most effective trap for Hugo was through his family. She cast a spell on an old oak tree during a family picnic, and Hugo's young son Rat was swallowed by the cursed tree and pulled somewhere else. A friendly mole finds Rat and gives him an old, dirty map — the only means of navigating the unknown part of the forest. Rat must find his way back through the terrain before the last grain of sand falls through the hourglass. If he makes it, Scylla gets what she deserves: launched into the air and into the Skull Cave wall.