quick glance. "You do remember the details of that case pretty well, Lord John!" he said.

"I'm an amateur follower in your famous footsteps," I reminded him. He smiled, called up a number and began telephoning. I admired the clear way in which he put what he wanted—or what I wanted—without wasting a word. He asked not only for the keys, but for the whole dossier in the double case of the Callender-Graham brothers. Then came a moment of waiting in which my heart ticked like a clock; but I contrived to answer Mr. Yelverton's mild questions about our weather on shipboard. At last a sharp ring heralded an end of suspense.

"Sorry, Lord John," the big man began, taking the receiver from the generous shell of his ear. "They're sending round the dossier, but our chaps have got none of the Callender-Graham 'exhibits in their possession—haven't had for nearly a year. I feared it was likely to be so. You see, there was no proof that any crime had been committed on either of the two brothers; in fact, the theory was against it. When the police definitely dropped the case—or cases—the family was entitled to all personal property of the deceased. Everything found on the body of Ned Callender-Graham was handed over to the relatives by their request, as had been done a few weeks after the elder brother's death, even the letters and those empty envelopes you were intelligent enough to single out for observation. We had done the same, naturally, but, in every sense of the word"—he grinned—"there was nothing in 'em."

"The keys on Ned's body were handed over to the Misses Callender, then?" I inquired, stiffening the muscles of my face to mask my disappointment.

"Yes. Perhaps, as you remember so much, you recall the fact that the first two keys were given to the relatives. Miss Marian Callender and her niece believed that Ned had Perry's keys in his pocket, which would mean there were but the two. The Callender ladies are the sole surviving relatives, or, anyhow, the nearest ones. But I've saved my bit of good news from head-quarters till the last. They 'phoned that there are duplicate keys. I thought I recalled something of the sort. Not sure but I suggested making them myself. That pretty millionairess girl might get herself engaged a third time, and if there were any more dead men found with latchkeys in their pockets, sample specimens might be very handy for our fellows."

Sam Yelverton finished with a laugh; but I couldn't echo it. I thought of Odell, of Grace Callender's lovely face and her young, spoilt life. I remembered the cruel nicknames "Belladonna" and "Poison Flower." If even the police prepared for a third tragedy, in case she thought again of marriage, no wonder the poor girl refused the man she loved.

"Will duplicates do for you, or do I lose my stage-box?" the big man asked.

I said aloud that I thought duplicates would answer my purpose, and silently to myself I said that they must do so.

Ten minutes later a policeman of some rank (what rank I couldn't tell, he being my first American specimen) brought in a parcel of considerable size. It contained many affidavits concerning the Callender-Graham tragedy; and on the top of these documents was a small, neatly labelled packet containing two keys.

The larger was entirely commonplace; and even the smaller one was at first glance a rather ordinary latchkey, of the Yale order. To an experienced and observant eye, however, it was of curious workmanship.

"Not a Yale, you see," said Yelverton, taking a magnifying glass from a small drawer of his tidy desk and passing it on to me. "What do you make of the thing?"

"Foreign, isn't it?" I remarked carelessly.

"Yes, we thought so. German—or Italian. Both the brothers had travelled abroad. On a Yale you would read the words 'Yale paracentric,' and a number. There's neither name nor number on that." He flung a gesture toward the key in my hand.

"May I take it away and keep it till to-morrow morning, to work out my plot with?" I asked. "The big one I don't care about. I give you my word I'll send this back in twenty-four—no, let's say twenty-five hours. I have an engagement for the twenty-fourth hour."

"All right," replied Yelverton good-naturedly. "You might bring the box-ticket with you. Ha, ha!"

"I will," I laughed. "And as to the dossier, may I sit somewhere out of your way and glance through it in case there's anything we can work up to strengthen the realism of our scenario? Of course, we'll guarantee to use nothing that might recall the Callender-Graham case to the public or dramatic critics."

"You can sit in the outer office and browse over the bundle till lunch-time, if you like," said Yelverton. "There's a table there in a quiet corner. I shall be off on business before you finish, I expect. See you later—at the Felborn Theatre, your first night. Wish you luck."

I thanked him and got up. Carr Price followed suit.

"Weren't you a bit premature mentioning the Felborn?" he reproached me in the next room, beyond earshot of Mr. Yelverton's secretaries and stenographers.

"No," I reassured him. "To-morrow, at this time or a little later, you'll know why. Meanwhile, don't worry, but take my word—and a taxi to the theatre. Tell Felborn I'm on the spot, and there's a truce between Odell and me, an armistice of twenty-four"—I pulled out my watch—"no, twenty-two and a half hours. Ask him to lend me his private office to-morrow morning from nine till ten o'clock. After that time you and he had better hold yourselves ready to be called in to discuss dates."

"You're either the wonder child of the British Empire or its champion fool," remarked Price somewhat waspishly, as he prepared to leave me alone with the Callender-Graham dossier.

"You've got till to-morrow to make up your mind which," said I, sitting down to my meal of manuscripts in order not to waste a minute out of the twenty-two and a half hours which remained to me. It would not have been wise to add that I didn't know which myself.

Many of the papers I passed over rapidly. Others gave me information that I couldn't have got from Odell without a confession of ignorance, or from the Misses Callender without impertinence. Among the latter was one summarising much of the family history; and, profiting by some smart detective's researches, I learned a good deal about Miss Grace Callender and her almost equally interesting aunt.

Even before the girl reached the age of sixteen, it seemed, she had begun to have offers of marriage. After her parents' death, when she was not quite fifteen, she had lived for a while with Miss Marian Callender at the house in Park Avenue left to her by her father. She had been taught by French governesses, German governesses and English governesses, but all had failed to prevent a kind of persecution by young men fascinated with the child's beauty or her money. At last Miss Callender senior had sent her niece to a boarding-school in the country where the supervision was notoriously strict, and had herself gone to Italy, her mother's native land, for a few months' visit. Eight or nine years before this Marian Callender had fallen in love with an Italian tenor, singing with enormous success in New York. The lady's half-brother—Grace's father—had objected to the marriage, and for that reason or some other the two had parted. Gossips said that the singer, Paolo Tostini, had not cared enough for Marian Callender to take her without a dot; and all she had came from her millionaire half-brother. At Graham Callender's death Marian's friends were surprised that she was left a yearly allowance (though a magnificently generous one) only while she "continued unmarried and acted as Grace's guardian." In the event of Grace's marriage, the girl was free to continue half the same allowance to her aunt if she chose. This was generally considered unjust to Marian, and the only excuse for the arrangement seemed to be that Graham Callender feared Paolo Tostini might come forward again if the woman he had