Under the light of a full moon, amid the sinister ruins of an ancient abbey, a man gasps out his last breath as he lies in a pool of his own blood. Who, amongst the residents of the sleepy little village, has a motive for the murder? And how is it connected to twelve silver statues of the apostles, missing for centuries, and the enigmatic Abbot's Key mentioned in a criminal's dying words? Superintendent Budd is called in to solve one of his most baffling cases.