For centuries, the village of Waterslain has hidden a dark secret. When Annie and Sandy set out to solve the mystery of the angels missing from the church roof, they soon discover someone else is on the same trail. Someone else who will stop at nothing to get there first. A series of clues leads Annie and Sandy nearer and nearer the truth, and into great danger. Can they rescue the angels, or will they themselves need rescuing from the dark and forbidden places into which their quest has led them?