He felt a great desire to see the site of the tragedy, but his natural caution prevented him from walking to it immediately. He was most anxious to avoid any suspicion that Mr. Deacon, the City merchant, was in any way interested in the fate of the ex-convict. But, on the other hand, there was no reason why he should not visit the ruins of the castle, the scene of the murder of King Edward the Martyr, three-quarters of a century before the Conquest. It was the show place of the district, the natural magnet for any casual visitor like himself.

The Professor climbed slowly up the steep slopes of the natural earthwork, which stands like a fortress guarding the only gap in the long range of the Purbeck hills, and listened attentively while the guide, delighted at finding a sympathetic audience so early in the year, recounted the history of the stronghold and indicated its more prominent features. Then, his inspection over, he sat down on the grass on the northeastern slope of the hill, and drew his ordnance map from his pocket.