It was a shocking blow, but she had her part all ready to step into. She gasped and said,

“Major Hardwick-he fell! I’m afraid he hit his head! Oh, Inspector Abbott, it is you! He went down-I am afraid he is hurt!”

For the next few moments Frank had not even time to think that he had probably failed to save James Hardwick’s life. He went down, and did not think until afterwards that he might be intended to stay there. But before he could clear his eyes or see what was happening he bumped into James coming up, grabbed him, and got a kick for his pains. They broke surface together, James with a gasping for breath and a wild flailing of the arms, Frank letting go and sheering off, since it was obvious that James was a good deal less dead than dangerous-muzzy in the head and fighting mad. Life-saving courses taught you how to knock the other fellow out when he tried to drown you, but in this case perhaps better not. Frank had seen that something bright in Adela Castleton’s hand as it fell. He thought James had probably been hit enough already, and just as well that he should be capable of self-defense in case there were any more tricks up the murderer’s sleeve.

But Adela Castleton was too intelligent not to know when she was beaten. She could have coped with one man half drowned and half stunned and have carried her plan through to the end, but not with this policeman, fit and strong, and as good a swimmer as herself. And even if she could have outwitted them both and eliminated them both, there was no way in which two such deaths could be explained. No, it was over. She had played, and she had lost. She told herself that it had been a good game and worth playing. She had nothing to regret.

By the time that James had stopped choking and Frank had helped him up on to the ledge from which he had fallen, Adela Castleton’s black and green scarf was a couple of hundred yards away. The water was perfectly calm and clear, and she was heading out to sea.

The person least surprised was Esther Field.

“You see, I have known Adela for so long, and she has always been the same-if she wanted something she wouldn’t let anyone or anything stand in the way. It always frightened me a little. Geoffrey Castleton was engaged to someone else before she married him, but she didn’t let it stand in her way. The other girl never had a chance-I don’t suppose Geoffrey had either. But he wasn’t really happy with her, you know, and he died young. I remember his saying to me once that after you were thirty there really wasn’t anything very much to look forward to.”

Miss Silver coughed.

“A tragic thing to say.”

Esther put her handkerchief to eyes already red.

“I couldn’t get it out of my mind. And he was considered such a rising man. I said something about that, and he said, ‘My dear Esther, one can’t live on a career.’ It was all very sad. And lately-lately I have been frightened. Not all the time, you know, but sometimes when it came over me. Because-well, you guessed, didn’t you, that Alan was trying to get money out of me. Those foolish letters that Irene wrote to Pen…People wouldn’t have understood them, or his answers. It just wasn’t in him not to be kind when a woman said she cared. But if they had been published it would all have been shockingly misunderstood. And if Alan had been trying to get money out of me-and he was-it seemed dreadfully likely that he was doing the same thing with Adela, and when he was stabbed-I couldn’t help-being afraid-” Her voice broke, and it was some moments before she could go on.

Miss Silver’s sympathetic attention helped her back to self-control.

“You are so kind,” she said. “It has always helped me to talk to you. It does help when things you hardly dare to think about-” She pressed her handkerchief to her eyes again. “That poor girl Marie-I didn’t like her very much, and I suppose she was trying to get money out of Adela too. But it was a fearful thing to do, and when everyone kept saying that it must have been a man, because no woman would have had the strength to choke anyone like that, I couldn’t help remembering how strong Adela was-” Her voice tripped and fell to a stumbling whisper. “She did-choke-a dog once. One of those big farm animals. It attacked her, and she got it by the throat-and choked it. I couldn’t help- remembering. But I didn’t think-she would try-and harm James-”

“He could not allow Miss Anning to be arrested.”

“No, no-of course not. The poor Annings- did you see them when you went down there just now? I ought to have asked before, but I somehow couldn’t think of anyone but Adela-only I must, mustn’t I? How are they?”

“Yes, I saw them. Miss Anning has been under a great strain, but her mother is surprisingly well. She has, in fact, to a great extent come out of the vague state in which she has been for so long.”

“I always liked her,” said Esther Field. “She wasn’t clever, you know-but don’t you think one gets a little tired of clever people? She was kind, and so fond of her family. I shall be so glad if she can be more like she used to be. It must have been very hard for Darsie. And then all these terrible things happening.”

It was some time before Inspector Abbott was free. He accompanied the motor launch which put out in search of Adela Castleton, and the search could not be given up in a hurry. She was a strong swimmer, and there was more than one possibility. It might have been her intention to swim out to sea until she could swim no more, or there might have been a moment when she turned shorewards again to make for another part of the beach. When at length the launch put back, he took time to change, have something to eat, and call in at the police station before responding to the message which awaited him there.

“It’s Miss Silver,” he told Inspector Colt. “She says Mrs. Anning has a statement to make.”

“Mrs. Anning!” His tone was one of protest. “Is she fit to make one?”

“Miss Silver says so. You had better come along and judge for yourself.”

Colt nodded.

“You’ll have to give me about twenty minutes before I can get away. We can meet at Sea View.”

Up at Cliff Edge there was much that Miss Silver was anxious to hear. The bare facts reluctantly imparted by James Hardwick had left her uncertain as to just how much Frank had overheard, and to what extent the police would now be satisfied as to the murderer’s identity.

When he had given her a lively account of what had happened, he said,

“And now perhaps you’ll tell me whether it was second sight, or witchcraft, or what-have-you that made you send me off to the Rock in the nick of time.”

The morning-room was an ugly room, but it was cool, and the chairs were comfortable. Frank’s slim length was stretched out in the largest of them. His fair hair shone. Suit and socks were a delicate study in grey. With eyes half shut and a teasing gleam between the lashes, he looked as if he had never exerted himself in his life.

Miss Silver, in a small upright chair, was engaged upon a crochet edging to one of the pink bootees. She thought it right to administer a mild reproof.

“My dear Frank, you should not use such exaggerated language.”

“The Chief definitely suspects you of knowing more than you ought to. He has a secret fund of country superstitions tucked away in the back of his mind, and there are times when you set them buzzing.”

The crochet-hook went in and out.

“Chief Inspector Lamb is a most worthy man. As to my suggestion that you should swim out to the Black Rock, I had already warned Major Hardwick that in my opinion he might be in considerable danger until he had told the police what he knew. I did not share that knowledge-I could only guess at it. And until it was shared, I felt sure that he would be in danger. It was, of course, plain to me that he could not allow Miss Anning’s arrest to take place, and that he intended to warn Lady Castleton before giving his information to the police. When, therefore, I learned that he was proposing to allow this conversation to take place at so dangerous and lonely a spot as the Black Rock, I began to feel extremely anxious.”