He remained profoundly silent for a moment, as if meditating his words, and then plunged into his tale.

The account of his own visit to Flint House on the night of the murder he related with details withheld from Sisily. The visit was the outcome of a quarrel between father and son over Robert Turold’s announcement about his wife’s previous marriage. Charles was shocked by his uncle’s decision to make the story public, and had wandered about the cliffs until dark trying to decide what to do. Ultimately he returned home and asked his father to use his influence with his brother to keep the secret in the family. His father called him a fool for suggesting such a thing, declined to offend his brother or blast his own prospects by such damned quixotic nonsense. On this Charles had announced his intention of seeing his uncle and telling him he would leave England immediately and forever unless the scandal was kept quiet. That made his father angry, and they quarrelled violently. Charles cut the quarrel short by flinging out of the house in the rain, to carry out his intention of interviewing his uncle. He walked across the moors to Flint House. The front door was open, the downstairs portion of the house in darkness, and his uncle lying upstairs in his study—dead.

He hurried over all this as of small importance in the deeper significance of Thalassa’s story. That was to him the great thing—the wonderful discovery which was to clear Sisily and put everything right. He believed that the plan which had brought him to Cornwall was working splendidly. The chance encounter with the detective was really providential—a speeding up, a saving of valuable time.

The possibility of disbelief did not dawn upon him. He overlooked that his listener was also his custodian and judge—the suspicious arbiter of a belated story told by one whose own actions were in the highest degree suspicious. His overburdened mind forgot these things in the excitement of hope. He talked with the candour and freedom of one young man confiding in another. When he had finished he looked at his companion expectantly, but Barrant’s eyes were coldly official.

“A strange story!” he said.

“A true one,” Charles eagerly rejoined. “Thalassa has been walking along the coast ever since in the expectation of finding this man. He will kill him if he meets him.”

It was Barrant’s lot to listen to many strange stories which were always true, according to the narrators, but generally they caused him to feel ashamed of the poverty of human invention. He was not immediately concerned to discover whether Thalassa’s story was true or false, or whether it had been concocted between him and Charles with the object of deceiving the authorities. The consideration of that infamous brownfaced scoundrel’s confession could be postponed—if it had ever been made. The present business was with Charles Turold. There was something infernally mysterious in his unexpected reappearance in that spot. He had gone to London when he disappeared—he admitted that. What had brought him back? To see Thalassa, as he said, in order to try and get at the truth? Nonsense! He—Barrant—was not simple enough to believe that. What then?

Barrant was not prepared to supply a ready answer to that question. But his trained ear had detected many gaps in the young man’s own narrative which, filled in, might give it. Turold knew more than he had said—he was keeping things back. Again—what things? Behind him stood the shadowy figure of the girl and her unexplained flight. Barrant’s instinct told him that Charles was shielding her. He turned to the task of endeavouring to reach the truth.

“Let’s go back a bit,” he said casually. “You’ve left one or two points in your own story unexplained. What about the key?”

“The key?” Charles started slightly. “You mean—”