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