An inexplicable trail of clues, scattered across the centuries and over the whole of the English landscape, leads Thomas Zwillinger from his job as a teacher into the pursuit of a dark and secret treasure. Against the stunning backdrop of some of England's least-known cathedral cities, this unwilling adventurer begins to unearth a mystery buried deep in our history, and kept hidden by the early Church elders. Who wants to hide the truth from him? Who has set these clues in the first place? And is there someone else who knows how close he is to unravelling one of the greatest mysteries the...