One fact was at that moment to me more curious than all others, namely, her friendship with Mrs. Blain, the woman who, according to the landlord, rented that house of mystery. By the exercise of care and discretion, I might, I told myself, learn something which would perhaps lead, if not to the solution of the enigma, then to some clue upon which the police might work. But to accomplish this I should be compelled to exercise the most extreme caution, for both mother and daughter were evidently acute to detect any attempt to gain their secret, while it seemed more than probable that Eva herself--if actually aware of the affair, which was, of course, not quite certain--had some motive in keeping all knowledge of it concealed. Who, a hundred times I wondered, was the man who, after lingering opposite Buckingham Palace, had entered the house in Ebury Street? Without doubt Eva had gone to the park to meet him, but it seemed that, growing impatient, or fearful of recognition by others, she had left before his arrival. True, the police had watched the house wherein the man disappeared, but up to the present he had not been seen again. Boyd had told me, when I had seen him that very morning, that he had left by some exit at the rear, and that his entry there was only to throw any watcher off the scent. It was evident that the man, whoever he was, had very ingeniously got clear away. Dick, who was playing tennis, at last came forward to be introduced to my divinity, and presently whispered to me his great admiration for her. I was about to tell him who she really was, but on reflection felt that I could act with greater discretion if the truth remained mine alone, together with the secret of my love for her. Therefore I held my peace, and he, in ignorance that she was the missing victim of that amazing tragedy, walked at her side along the water's edge, laughing merrily, and greatly enjoying her companionship. Mrs. Blain invited us all to dine, but the Moberlys were compelled to decline, they having a party of friends at home. Therefore, we saw them off amid many shouts, hand-wavings and peals of laughter, and when they had gone we sat again on the lawn, now brilliant in the golden blaze of sundown. It still wanted an hour to dinner, therefore Mary suggested that we all four should go out on the water, a proposal accepted with mutual enthusiasm. As I was not an expert in punting, Mary and Dick pushed off in the punt, the former handling the long pole with a deftness acquired by constant practice, while, with Eva Glaslyn in the stern of a gig, I rolled up my sleeves and bent to the oars. The sunset was one of those gorgeous combinations of crimson and gold which those who frequent the Thames know so well. Upstream the flood of crimson of the dying day caused the elms and willows to stand out black against the cloudless sky, while every ripple caused by the boat caught the sun-glow until the water seemed red as blood.