Summer, 1584. Sir Francis Walsingham, spymaster to Queen Elizabeth, has long suspected an undercurrent of Catholic resistance in the city that was once England's greatest centre of pilgrimage. He calls Giordano Bruno, his maverick secret agent, away from his post at the French Embassy to investigate. But when Bruno arrives in Canterbury, he has no idea of the dark secrets he's about to uncover. He must turn his detective's eye on history, on Saint Thomas Becket, the twelfth-century archbishop murdered in Canterbury Cathedral, and on the legend surrounding the disappearance of his body, in order to solve the crime.