Sam and Chloe never thought they would spend the summer holidays fighting a battle against the dark past that haunts Kingsholt.

Sam and Chloe never thought they would spend the summer holidays fighting a battle against the dark past that haunts Kingsholt, a mansion inherited by Chloe's parents. A long time ago the Vikings burnt down the monastery that was built near Kingsholt. A few monks who escaped hid the monastery's treasure and dug a pit in which to bury the slaughtered monks. They swore that if anyone opened up the pit and used it for other purposes a darkness would fall over the area. Nimbus,an obsessive one-time circus hypnotist and acrobat, lives with his wife and two children in a cottage in the woods of Kingsholt. He opens up the pit and uses it for all his rubbish. With death, kidnap and madness ensuing, can Sam and Chloe and their guardian Aidan, bring back the light to Kingsholt?