“Look,” muttered Kennedy under his breath to us and nodding down the lobby.

Shelby Maddox had sought and found Winifred, and was chatting as animatedly as if there had been no Paquita in the world less than five minutes before.

As we watched, Hastings remarked: “It was only the day before the murder that Shelby first met Winifred Walcott. I believe he had never seen his brother-in-law’s sister before. She had been away in the West ever since Frances Maddox married Walcott. Winifred seems to have made a quick conquest.”

Remembering what had happened before, I took a quick look about to see whether any one else was as interested as ourselves. Seeing no one, Kennedy and I strolled down the corridor quietly.

We had not gone far before we stopped simultaneously. Nestled in the protecting wings of a big wicker chair was Paquita, and as we watched her she never took her eyes from the couple ahead.

What did this constant espionage of Shelby mean? For one thing, we must place this little adventuress in the drama of the Maddox house of hate. We moved back a bit where we could see them all.

A light footfall beside us caused us to turn suddenly. It was Mito, padding along on some errand to his master. As he passed I saw that his beady eyes had noted that we were watching Shelby. There was no use to retreat now. We had been observed. Mito passed, bestowing a quick sidewise glance on Paquita as he did so. A moment later he approached Shelby deferentially and stood waiting a few feet away.

Shelby looked up and saw his valet, bowed an excuse to Winifred, and strode over to where Mito was standing. The conversation was brief. What it was about we had no means of determining, but of one thing we were certain. Mito had not neglected a hasty word to his master that he was watched. For, an instant later when Mito had been dismissed, Shelby returned to Winifred and they walked deliberately out of the hotel across a wide stretch of open lawn in the direction of the tennis-courts. To follow him was a confession that we were watching. Evidently, too, that had been Shelby’s purpose, for as he chatted he turned half-way, now and then, to see if they were observed. Again Mito padded by and I fancied I caught a subtle smile on his saturnine face. If we were watching, we were ourselves no less watched.

There was nothing to be gained in this blind game of hide-and-seek, and Kennedy was evidently not yet prepared to come out into the open. Paquita, too, seemed to relinquish the espionage for the moment, for she rose and walked slowly toward the Casino, where she was quickly joined by some of her more ardent admirers.

I glanced at Kennedy.