Whentheirmotherishospitalizedinacaraccident,PimandPuttsuddenlydiscoverthattheyhaveasetofgrandparentsthey'
veneverknownabout.Butaterrifyingtruthhaslongbeenhiddenwithinthewallsoftheirgrandparents’house,atruththatgraduallyrevealsitselftoPimandPuttthroughamysticalhole,unleashinghair-raisinghorrorontheirfamily.