Set in early 1900s London, this metaphysical thriller follows undercover officer Gabriel Syme and his secret involvement with Scotland Yard's task force that attempts to take down underground anarchists. In doing so, Syme encounters Lucian Gregory, a passionate anarchist who eventually takes him to the areas secret meeting place. From there Syme influences his peers and eventually is voted to the central council. While Syme attempts to destroy the council of anarchists from the inside, He only uncovers more secrets, each more mysterious than the last. Using many Christian allegories and themes of suffering, this classic G. K. Chesterton novel leaves listeners on the edge of their seat until the final secrets are uncovered.