“She has been handling a job that is dull as ditch-water,” Wallace put in quickly.

“She will not find my work dull, but it will be cold, for it may take her to the Bering Sea,” Mr. Howe informed them. “I expect to be ready for her soon.”

“It sounds no end exciting,” Roberta said and her eyes sparkled. A job that would take her to the Bering Sea appeared to have endless possibilities and she was keenly interested. Just then the phone rang and Mr. Trowbridge answered it.

“Your passenger has arrived,” he told Roberta.

“I’ll go right down.”

“See you later,” Mr. Howe called after her as she hurried away. Ten minutes later Nike, her own prize plane, was taxied to the edge of the field, where Roberta and her passenger, a tall, slender woman, whose flying costume, however, gave her huge proportions, waited. The machine came up just as Mr. Wallace and Mr. Howe, in the company’s carrying automobile started for the further end of the field.

“There is to be a test for the racing machines this evening, Miss Langwell,” the instructor called as he brought the car to a stop close to where the two were standing. Roberta noticed that the Federal man gave her companion a swift, all-inclusive glance, but since that was the way with Mr. Howe, and he always looked everybody up and down, she did not think anything about it.

“Hope I can watch it,” she replied.

“All set, Miss Langwell.” Nike came to a stop a few yards away, so, forgetting everything else, Roberta turned her whole attention to the task at hand. Presently all was ready, and in another moment, Nike was leaping into the air, carrying her pilot and passenger up a steep climb until they were well in the air, then her nose was leveled and she shot east and south, as Mrs. Pollzoff designated the direction she wished to take.

Having taken the woman every day for over two weeks, Roberta knew pretty well how high and fast she preferred to travel, so they did not waste any time on discussions, but shot ahead swiftly. Almost as soon as she was seated, Mrs. Pollzoff got the powerful field glasses out of their case, and as soon as they were over the water, trained them on its smooth surface. The day was clear, the sky blue, and the sea calm, so the task of piloting was not arduous, and Roberta let her mind wander on speculations about her companion. That the woman was wealthy was obvious, but for the first time the girl began to wonder about her interest in things in the ocean. It occurred to her that the woman might be looking for sunken vessels, or something of that nature, but she had never let a word drop regarding what she sought. Then it struck Roberta that she was a bit mysterious. Although it wasn’t necessary for passengers to explain their businesses or hobbies, still when anyone traveled day after day with the same pilot it was only natural that they should establish more or less friendly relations and exchange odds and ends about each other. Thinking it over carefully, the girl realized that except for the facts that Mrs. Pollzoff’s husband had come to the United States from Russia when he was a lad, that he had gone into the fur business, and had been dead two years, she knew nothing more than the bit of information gleaned in the office regarding the failure to pass the flying tests to fly her own machine.