kind of ghostly silence.

"It is most extraordinary how the girls and Dan and Billy have disappeared," Mrs. Burton whispered plaintively, scarcely daring to speak in a natural tone.

She and Mrs. Burton had passed through one of the colonnades and were now in the old court in the rear. Along one side ran a line of forsaken cloisters.

"Wait a moment, Mollie, please," Mrs. Burton murmured.

Adding to the enchantment of the present scene she could hear again the sound of music. The two musicians who had been singing on the veranda across from their hotel also must have wandered into the mission grounds.

Then, almost at the same instant, Mrs. Burton and Mrs. Webster discovered the Camp Fire girls.

Beyond the enclosed space of the old mission lay a broad piece of open ground. Over it tonight poured the unbroken radiance of the moon. In time long past this ground had been devoted to the use of the Indians who were being taught Christianity and the habits of civilization by the Spanish fathers. In those days this ground was encircled by a row of Indian huts. One part was set apart for the Indian women and girls, and here the Indian maiden remained in seclusion until her wedding day.

But tonight, in some mysterious fashion, the past seemed to have came back, for a group of Indian maidens had returned to their former dwelling place.

"The picture is too lovely to disturb," Mrs. Burton whispered irresolutely.

In the moonlight one could not discern the differences in the costumes of the Camp Fire girls, nor their fairer coloring.

Bettina, Marta, Peggy and Alice Ashton were seated upon the ground, forming a square, with Dan standing apparently hovering like a guardian angel above them.

As usual, Billy Webster was lying gazing up at the sky and Vera Lagerloff was sitting beside him.

A little apart from the others Gerry Williams and Sally Ashton were strolling up and down with their arms intertwined.

"Do you think we should speak of our plan immediately?" Bettina Graham was inquiring of the other three girls. "Unless we can carry it out I don't feel that we have the right to our Camp Fire summer together."

In the moonlight her yellow brown hair had turned a bright gold.

Peggy, who was ever a direct and sensible person, shook her head.

"We must wait until we have found the location for our camp and are fairly well settled," she replied. "At present our own ideas as to what we can do to help with the war work are much too vague. But I suppose we shall be near the great National Guard war training camp, and that in itself ought to be an inspiration. Have you ever heard from your wounded lieutenant, Bettina? It was amusing to have him and his friend to tea in so unexpected a fashion. I shall never forget how amazed the family was on discovering us with soldier guests. I am sorry we have never seen either of them again."

"I have had one note from Lieutenant Carson, saying that he was all right," Bettina answered. "He will probably be stationed at the cantonment near here. I wish for your sake Ralph Marshall was to be there instead."

There was no engagement existing between Peggy Webster and Ralph Marshall. But Peggy was too transparent a person to conceal her interest in Ralph after their past summer of misunderstanding and final reconciliation. As Ralph had volunteered and joined the aviation corps soon after the entry of the United States into the war, she had not seen him in many months. But it was understood that they wrote to each other and Peggy openly expressed her pride in Ralph's courage and ability. Ralph had been offered an opportunity to remain in his own country and act as an aviation instructor, but instead had chosen to go to France. At the present time he was in a camp on Long Island waiting his hour for sailing.

Before Peggy could make a reply to Bettina's final speech, the four girls saw their Camp Fire guardians approaching and rose to greet them.

"You girls look too picturesque to disturb, and yet we must not remain outdoors all night, no matter how the beauty of the night tempts us. I trust we may have many other nights as radiant as this before our summer is over," said Mrs. Burton, half apologizing for her own and her sister's intrusion.

A few moments later the Sunrise Camp Fire girls were walking slowly away from the mission grounds to their own rose-covered hotel.

Not by accident, but because of a common purpose, Sally and Gerry managed to linger a few yards behind the others.

The singing which had so fascinated Mrs. Burton and added to the witchery of the night had also attracted the attention of the two girls. But it was not the music alone which had charmed them. In their careless strolling up and down apart from their companions, Sally and Gerry had dimly seen the figures of the two musicians.

The mysterious singers had kept always in the background, only approaching sufficiently near for their songs to be heard; and yet, notwithstanding this, Sally and Gerry had managed to find out that they were two young men dressed in Mexican costumes. But whether they were Mexicans or Americans they could not guess, since it was impossible to see their faces and they seemed able to sing Spanish or English songs with equal ease.

The fact was that Gerry and Sally had arranged a scheme between them by which they hoped to make a desired discovery. Their scheme would have appalled the other Camp Fire girls, but they chanced to have unlike views in regard to the agreeable adventures and experiences of life. Moreover, they often preferred bestowing their confidences only upon each other.

As the rest of the Camp Fire party moved on, both Sally and Gerry became aware that the musicians were growing bolder and were drawing nearer.

Both girls would have liked to turn round and deliberately look back. Yet they had scarcely the courage for this breach of taste, in spite of the fact that it was night and the redeeming grace of the moonlight rested over them.

Sally was carrying a little beaded Indian bag which she managed to drop without any one, aside from Gerry, noticing.

After going on a little further, unexpectedly they turned back to pick up the lost possession.

The two young men were thus within only a few feet of them.

There was but little satisfaction in the adventure, nevertheless, for although one of the musicians stepped forward and gravely presented Sally with the Indian bag he had observed on the ground between them; yet neither he nor his companion spoke and it was impossible, with their broad Mexican hats, to obtain a satisfactory view of their faces without revealing too great curiosity.

As a matter of fact, the entire Camp Fire party was unaware of the interest their appearance in the little town of Capistrano during the afternoon had excited. There were always tourists visiting the old mission, especially at this season of the year. But the number and appearance of the girls, their picturesque, half Indian costumes, which always puzzled people unacquainted with the Camp Fire uniform, and the big wagon carrying their large camping outfit, gave them a unique distinction.

CHAPTER III

The Call to Service

On a ledge of rock with the Pacific Ocean as a background a girl was standing, holding a bugle to her lips and with it sounding a clear, musical call.

Not far off a number of persons were seated about a smouldering camp fire. All day the sun had been hot, almost as a tropic sun, but now with the coming of the late afternoon a cool breeze was blowing in from the sea.

The feminine members of the little circle were knitting and sewing.

One of the two young men was holding a hank of wool, which a brown-haired, brown-eyed girl was winding slowly and carefully into a great ball. The other was lying full length on the ground looking toward the water.

"Why is my Sister Peggy