Rachel and Adam are sent to stay with their grandmother, following their parents' divorce. But the quiet English village is a sinister, unsettling place. Is there a dark heart beating beneath the thatched roofs of Triskellion? It is a place protected by an ancient, three-bladed artefact; a village where crops never fail and where the war memorial is blank; a community with much to protect. With the help of the mysterious Gabriel, Rachel and Adam begin to unearth centuries-old secrets and make a shocking revelation about their family's past - and their own future...