nodded. "Undoubtedly the effect of the dances is in direct ratio to the sexual temperament of the dancer," he admitted.
He paused and again watched the whirl.
"Does Mrs. Seabury herself understand it?" he mused, only half speaking to me. "I'm sure that this Sherburne is clever enough to do so, at any rate."
A hearty round of applause came from the dancers as the music ceased. None left the floor, however, but remained waiting for the encore eagerly, scarcely changing the positions in which they had stopped.
"To my mind," Kennedy resumed, with the music, "several things seem significant. Many people have noticed that after marriage women generally lose much of their ardor for dancing. I feel that it is an unsafe matter on which to generalize, but—well—Mrs. Seabury seems not to have lost it."
"Then," I inquired quickly, "you imply that—she is not really as much in love with her husband as she would have us think—or, perhaps, herself believes?"
"Not quite that," he replied doubtfully. "But I am wondering whether there is such a factor that must be considered."
Before I could answer Kennedy touched my arm. Instinctively I followed the direction of his eye and saw Mrs. Seabury step out on the floor across from us. Without a word from Craig, I realized that the man with her must be Sherburne, our "tango thief."
Fashionably dressed, affable, seemingly superficially, at least, well educated, tall, graceful, with easy manners, I could not help seeing at a glance that he was one of the most erotic dancers on the little floor.
As they passed near us, Mrs. Seabury caught Kennedy's eye in momentary recognition. Her face, flushed with the dance, colored perhaps a shade deeper, but not noticeably to her partner, who was devoting himself wholly and skillfully to leading her in a manner that one could see called forth frequent comment from others, less favored.
As they sat down after this dance and the encore, Craig motioned to the waiter at our table and whispered to him.
A few moments later, a man whom I had seen around the hotel on my infrequent visits, but did not know, slipped quietly into a seat beside Kennedy, even deeper in the shadow of the recess in which we were sitting.
"Walter, I'd like to have you meet Mr. Dunn, the house detective," whispered Kennedy under his breath.
The usual interchange of remarks followed, during which Dunn was evidently waiting for Kennedy to reveal the real purpose of our visit.
"By the way, Dunn," remarked Craig at length, "who is that fellow—over there with the woman in blue—the fellow with the heavy braided coat?"
Dunn craned his neck cautiously, then shrugged his shoulders. "I've seen him here with her before," he remarked. "I don't know him, though. Why?"
Briefly Kennedy sketched such facts of a supposedly hypothetical case as would be likely to secure an opinion from the house man. Dunn narrowed his eyes thoughtfully.
"That's rather a ticklish situation, Kennedy," Dunn remarked when Craig had stated the case, omitting all reference to Seabury's name as well as his suspicions. "Of course," he went on, "I know we've got to protect the name of the hotel. And I know we can't have men meeting our women patrons, doing a gavotte or two—and then fox-trotting them into blackmail."
Dunn stroked his chin thoughtfully. "You see, we can do a great deal to suppress card sharps, agents for fake mining stocks, passers of worthless checks, and confidence men of that sort. But it is not so simple to thwart the vultures who prey on the gullibility and passions of the so-called idle rich."
"There must be something you can do to get it on this fellow, though," persisted Craig.
"Well," considered the house man, "we have what might be called our hotel secret service—several men and women operating entirely apart from the hotel force of detectives who, like myself, are too well known to clever crooks. Nobody knows them, except myself. There's one—that girl over there dancing with that middle-aged man who has mail sent here but doesn't live here. Could they be of use?"
"Just the thing," exclaimed Craig enthusiastically. "Can't you have her get acquainted—just as a precaution—with that man? His name, by the way, I understand is Sherburne."
"I'll do it," agreed Dunn, rising unostentatiously.
Just then I happened to glance across the floor and over the heads of those seated at the tables at a door opposite us. It was my turn hastily to seize Kennedy's elbow.
"Good God!" I exclaimed involuntarily.
There, in the further doorway of the tea room, stood Judson Seabury himself!
Without a word, Craig rose and quickly crossed the dancing floor, stopping before Mrs. Seabury's table. Instead of waiting to be introduced, he sat down deliberately, as though he had been there all the time and had just gone out of the room and come back. He did it all so quickly that he was able in a perfectly natural way to turn and see that Seabury himself had been watching and now was advancing slowly, picking his way among the crowded tables.
From around my corner I saw Craig whisper a word or two to Mrs. Seabury, then rise and meet Seabury less than halfway from the door by which he had been standing.
The tension of the situation was too much for Mrs. Seabury. Confounded and bewildered, she fled precipitately, passing within a few feet of my table. Her face was positively ghastly.
As for Sherburne, he merely sat a moment and surveyed the irate husband with calm and studied insolence at a safe distance. Then he, too, rose and turned deliberately on his heel.
Curious to know how Craig would meet the dilemma, I watched eagerly and was surprised to see Seabury, after a moment's whispered talk, turn and leave the tea room by the same door through which he had entered.
"What did you do?" I asked, as Craig rejoined me a few moments later. "What did you say? My hat's off to you," I added in admiration.
"Told him I had trailed her here with one of my operatives, but was convinced there was nothing wrong, after all," he returned.
"You mean," I asked as the result of Craig's quick thinking dawned on me, "that you told him Sherburne was your operative?"
Kennedy nodded. "I want to see him, now, if I can," he said simply.
Chapter VI
The Serum Diagnosis
We paid our check and Kennedy and I sauntered in the direction Sherburne had taken, finding him ultimately in the cafe, alone. Without further introduction Kennedy approached him.
"So—you are a detective?" sneered Sherburne superciliously, elevating his eyebrows just the fraction of an inch.
"Not exactly," parried Kennedy, seating himself beside Sherburne. Then in a tone as if he were willing to get down, without further preliminary, to business, seemingly negotiating, he asked: "Mr. Sherburne, may I ask just what it is on which you base your claim on Mrs. Seabury? Is it merely meeting her here? If that is so you must know that it amounts to nothing—now."
