"I saw that," said Dan, "and wondered at it."

"I think the French officer was trying to flag to us an intimation that Pembroke isn't one who would pa.s.s inspection in naval circles."

"No?" gasped Danny Grin, looking genuinely astonished. "It never struck me that way. He had the appearance and the manners of a gentleman."

"So has many an international confidence man," Dave rejoined. "I don't know a blessed thing against Pembroke, and perhaps the Frenchman doesn't either. Unless I can find out something definite about the Englishman, I hardly care to be the one to introduce him to our little wardroom crowd."

"I see," nodded Dalzell thoughtfully. "You're right, Dave. One can't be too careful about his introductions, nor can one very well receive callers on board ship without making them known to the other wardroom fellows."

After the three battleships on which our young naval officers had served, the "Castoga" did seem small by comparison, although she was a gunboat of comfortable dimensions, with an ample wardroom for the number of officers carried, and with all the ordinary provisions for comfort afloat.

With a crew of one hundred and thirty sailors supplemented by a detachment of thirty marines; with a large enough crew in the engineer's department, and with nine officers, including a surgeon and a paymaster's clerk, in addition to three engineer officers, the "Castoga" carried a businesslike complement.

Lieutenant-Commander Tuthill was the commanding officer, with Lieutenant Warden as executive officer. The four watch officers were all ensigns.

After reporting their return to the officer of the deck, Dave and Dan went promptly to their quarters. Here, after bathing, they dressed for dinner, which was due to be served in less than half an hour.

At table, later, Dave told the tale of the robbery that afternoon. Dan added the tale of their meeting with Pembroke, and of that Englishman's offer to loan them money.

"What kind of fellow is that Pembroke?" asked Lieutenant Warden.

Dave described the Englishman, adding, questioningly:

"Do you know him, sir, or know of him?"

"No," replied Mr. Warden.

"I thought that Pembroke must be known to a French naval officer who pa.s.sed us," continued Darrin, and related that incident, too.

"The Frenchman's shrug was nothing against the Englishman," remarked Lieutenant Warden. "It might have been merely instinctive aversion, or it might mean merely that the Frenchman and the Englishman had a dispute in the past, at this or some other port. Otherwise it would be odd indeed to see a Frenchman turn the cold shoulder on an Englishman when their countrymen are standing shoulder to shoulder on the long battle lines in Europe."

"Surely, if the French officer knew Pembroke to be a gentleman, he would have rushed up and gripped Pembroke's hand just out of a sentimental feeling for the strong bonds of friendship between France and England in these dark days in Europe," nodded Dan understandingly.

"Pembroke wanted to come on board, sir," Ensign Darrin went on, "but I couldn't help feeling that, before inviting him, I would like to know more about him."

"Caution of that sort is never amiss," nodded the executive officer thoughtfully. "By the way, you don't imagine that there could have been any connection between the thieving Chinese and Mr. Pembroke, do you?"

"Why, I hadn't thought of it in that way," Ensign Darrin confessed.

"There isn't usually, is there, much connection between a thief who robs you and a man who offers to lend you a little money?"

"There might be easily," said Mr. Warden.

"Our last half hour on sh.o.r.e was a puzzle altogether," Dave went on, after a short pause. "First, we followed that burnt-face Chinaman. Then we ran into a crowd of Chinese who cleaned out our pockets of everything but our watches. And then we met Pembroke, at whom the French officer turned up his nose. I am now actually beginning to wonder if 'Burnt-face,' the thieves and Pembroke may not all be links in a chain of mystery."

"At least Pembroke doesn't speak or understand the Chinese language,"

Dalzell broke in.

"He _said_ he didn't," Dave returned. "However, if Pembroke is not a gentleman and a straightforward fellow, it is as easy to believe that he lied as that he spoke the truth."

"Don't bother any more about it," advised Ensign Hale bluffly. "The money is gone. As to the rest of the story, it isn't worth puzzling your heads over. Your adventure was all grossly material. No such things as mysteries or romances are left in the world-nothing but work."

"Nevertheless," smiled Ensign Darrin seriously, "I shall continue to admit myself puzzled until I have succeeded in gathering certain information that I really wish."

"What kind of information?" asked Hale.

"For instance, I want to know if 'Burnt-face' has any connection with the yellow boys who went through our pockets."

"I think that at least half likely," replied Ensign Hale gravely.

"And then, next, I want to know," Darrin went on, "if there is any connection between 'Burnt-face' and Pembroke."

"That is much less likely," answered Hale.

"Last of all, if Pembroke is in the least shady, I'd like to know something definite about him," wound up Ensign Dave.

"Go to the Frenchman for that," advised Hale.

"Thank you; I believe I shall."

"But what does it matter, Darrin," asked Lieutenant Warden, "whether Pembroke is all right, or not? You turned him aside from visiting this craft, so what does it matter whether the fellow is a gentleman or the reverse?"

"Because," replied Dave Darrin, so solemnly that some of his brother officers stared, "I have a premonition that I'm going to meet Pembroke again, and under conditions where I shall be glad to know something definite about the fellow."

At eight bells in the evening Ensign Dalzell went on duty as officer of the deck. Darrin, aroused in season from a nap, took over the watch at midnight.

"Any orders?" asked Darrin of his chum.

"None, save the usual orders for the safety and security of the ship,"

Dalzell replied. Salutes were exchanged, and the former officer of the deck hurried to his quarters.

A marine sentry paced aft, another forward. Six sailormen, including two petty officers, occupied their posts about the deck and on the bridge. Two or three of the engine-room crew were on watch below. The others on board slept, for the night was clear and the gunboat at anchorage half a mile out from the mouth of the Pasig River.

After the first tour of inspection to see that all was snug, Ensign Darrin leaned against the quarter rail, looking out over the water. By this time the sky had clouded somewhat, though the barometer remained stationary, showing that no atmospheric disturbances were to be looked for at present.

The night was so still that nothing but the discipline of trained habit prevented Ensign Darrin from nodding, then falling asleep.

Even as it was, his eyelids drooped almost to the closing point as he leaned there over the rail. But he was not asleep.

After some minutes Dave opened his eyes wider, straightened up and glanced out sharply over the water, on which objects were not now so clearly visible as they had been at midnight.

"That sounded like a paddle," Darrin told himself, then added, in a low voice:

"Sentry!"

"Aye, aye, sir," replied the marine, in a low voice, at the same time giving the rifle salute.

"I thought I heard a boat approaching yonder. Keep your eye open for any kind of craft coming near."

"Aye, aye, sir!"