“Yes; this is not the first time I’ve seen her, either, although I did not know who she was until now. The other day, Bates, I witnessed a queer incident outside the Hotel Mammoth. I was passing there just as that woman came out of the Thirty-fourth Street entrance and entered a taxicab. My attention was attracted to her not only because of her striking beauty, but because of the nervousness she displayed. As she stepped into the cab she kept glancing about her in all directions, as though aware that she was being watched. As she drove off I noticed a man skulking in the doorway of a store on the opposite side of the street. It was that same dark-skinned, bearded chap who just passed us. I saw him hurry across the street and rush up to another taxi that was waiting at the cab stand. I heard him instruct the driver to follow the woman’s cab, no matter where it went. He spoke in English, but with a decidedly foreign accent. My curiosity was aroused, and I decided to see the thing out. I, too, jumped into a taxi and joined in the procession.

“Straight down Fifth Avenue we went, as far as Washington Square. Then the three of us turned into a side street, and came to a stop. The woman’s cab had halted outside the door of a dingy-looking house in a neighborhood which had seen better days, but which now consists mostly of cheap rooming houses. The bearded man’s cab had drawn up about fifty yards away. He jumped out quickly, and I alighted, too, as inconspicuously as possible. A surprise awaited us both. The first cab was empty. The woman had disappeared.”

Bates laughed knowingly. “She must have been wise to the fact that she was being shadowed, and took advantage of a chance to drop out somewhere along the trail.”

“Of course. It’s an old trick. You ought to have seen our bearded friend’s face when he found that he had been fooled. He said a lot of things to himself in Spanish. I have enough knowledge of that language to know that his utterances weren’t fit for publication. Wonder if he’s shadowing her again now.”

“Most likely,” said Bates. “I suppose he’s one of Portiforo’s spies. Naturally, the present government of Baracoa would be interested in the movements of Señora Felix. I presume they hope, by watching her, to get a line on where her husband is.”

“You think she knows that?”

“It is more than a bare possibility. Felix hasn’t been heard of since he landed from his yacht on the south coast of France two years ago, but it is exceedingly likely that he has been in communication with his wife. I understand they were a very devoted couple. In fact, it was a surprise to everybody that when he skipped he didn’t take her along. Well, here we are at the White House grounds. See you later, old man. I am burning up with curiosity to know what the president wants of you.”

Bates’ curiosity in that respect was not destined to be gratified that day, nor for many days after. When the Camera Chap returned from his interview with the president, and dropped in at the Sentinel bureau, he was provokingly uncommunicative.

“It was a fine lunch,” he said. “The White House chef certainly knows his business; and the president is a genial host. He is one of the most democratic men I have ever met.”

“But what did you talk about?” Bates asked impatiently. “I know very well that he didn’t send for you merely to make your acquaintance. What did he want, old man? You can trust me, you know.”