"I was wondering whether he hadn't escaped from an asylum," I answered.

"I wonder what he was doing on the green," Quarles went on. "I saw no one else playing this afternoon, so he had the green to himself, except for the little time we disturbed him. When I first saw him it didn't seem to me that he was practicing putting, and I thought he watched us rather curiously."

"A theory, professor?" I asked with a smile.

"No, no; just wonder. By the way, don't say anything to that expert who was so certain that the yacht couldn't get into the creek. He mightn't like to know he was mistaken."

After dinner that evening Zena and I went out. There was no moon; indeed, it was not very pleasant weather, but it was a pleasant walk, and entirely to my satisfaction.

When we returned I found Quarles in a corner of the smoking room leaning back in an armchair with his eyes closed. He looked up suddenly as I approached him.

"Cold out?" he asked.

"Nothing to speak of."

"Feel inclined to go a little way with me now?"

"Certainly."

"Good! Say in a quarter of an hour's time. I shall get out of this dress and put on some warmer clothes. I should advise you to do the same."

I took his advice, and I was not surprised when he turned to me as soon as we had left the hotel and said:

"That yacht, Wigan; we'll go and have a look at her."

"It's too dark to see her."

"She may show a light," he chuckled. "Anyway, we will go and have a look."

We started along the front in the direction of the golf course, but at the end of the parade, instead of turning inland as I expected, to cross the course to the creek, Quarles led the way on to the sands.

Here was a favorite bathing place, and there were many small tents nestling under the sandhills, looking a little the worse for last night's gale. At this hour the spot was quite deserted.

"Getting toward high water," said the professor, "and a smooth sea to-night. Can you row, Wigan?"

"An oarsman would probably say I couldn't," I answered.

"There's a stout little boat hereabouts--takes swimmers out for a dive into deep water. We'll borrow it, and see what you can do."

Always there was something in Quarles's way of going to work which had the effect of giving one a thrill, of stringing up the nerves, and making one eager to know all that was in his mind. You were satisfied there was something more to learn, and felt it would be worth learning. I asked no questions now as I helped to push a good-sized dinghy into the water. Oars were in it, and a coil of rope.

"Anyone might go off with it," said Quarles. "I noticed the other day that the boatman did not trouble to take the oars out. I suppose he believes in the honesty of Lingham."

If I am no great stylist, I am not deficient in muscle, and, with the set of the tide to help me, we were not long in making the mouth of the creek.

"The yacht is some way up, Wigan, and maybe there are sharp ears on her. Tie your handkerchief round that rowlock, and I'll tie mine round this. You must pull gently and make no noise. The tide is still running in, and will carry us up. By the way, when you're on holiday do you still keep your hip pocket filled?"

"Yes, when I go on expeditions of this sort."

"Good! Keep under the bank as much as possible, and don't stick on the mud."

I did little more than keep the boat straight, was careful not to make any noise, and in the shadow of the bank we were not very likely to be seen. A heavy, leaden sky made the night dark, and there was a sullen rush in the water.

"Steady!" whispered Quarles.

We were abreast of the first of the piles which I had noticed in the morning. Now it was standing out of water instead of mud.

"She shows no light," said Quarles. "We'll get alongside."

With the incoming tide the yacht had swung around, and was straining at the hawser which held her, the water slapping at her bows with fretful insistency. Quarles held on to her, bringing us with a slight b.u.mp against her side. Keen ears would have heard the contact, but no voice challenged.

We had come up on the side of the yacht which was nearest the golf course.

"There's no boat fastened to her, Wigan," said Quarles. "Probably there is no one on board. Let's go round to the other side."

There we found the steps used for boarding her.

"If there's anyone here, Wigan, we're two landlubbers who've got benighted and have a bad attack of nerves," whispered Quarles. "Hitch one end of that coil of rope to the painter, so that when we fasten our boat to the stays on the other side of the yacht she'll float far astern. When they return they are almost certain to come up on this side to the steps, so will not be likely either to see the rope or our boat in the dark."

I fastened the rope to the painter as Quarles suggested, and climbed on to the yacht after him. Then I let the tide carry our boat astern, and, crossing the deck, tied the other end of the rope securely to the stays on the other side.

The sky seemed to have become heavier and more leaden; it was too dark to see anything clearly. There was little wind, yet a subdued and ghostly note sounded in the yacht's rigging, and the water swirling at her bows seemed to emphasize her loneliness. So far as I could see, she was in exactly the same condition as when I had seen her from the golf course. No one was on deck, and no sound came from below.

"Queer feeling about her, don't you think?" said Quarles. "We're just deadly afraid of the night and spooks, that's what we are if there is anyone to question us."

I followed him down into the cabin. At the foot of the companion Quarles flashed a pocket electric torch. It was only a momentary flash, then darkness again as he gave a warning little hiss.

Three gla.s.ses on the table was all I had seen. I supposed the professor had seen something more, but I was wrong.

After standing perfectly motionless for a minute or so, he flashed the light again, and sent the ray round the cabin. The appointments were faded, the covering of the long, fixed seats on either side of the table was torn in places. One of these seats had evidently served as a bunk, for a pillow and folded blanket were lying upon it. All the paint work was dirty and scratched. Forward, there was a door into the galley; aft, another door to another cabin.

"A crew of three," said Quarles. "Three gla.s.ses, plenty of liquor left in the bottle in the rack yonder, a pipe and a pouch, and a conundrum."

He let the light rest on a sheet of paper lying beside the gla.s.ses. On it was written: "S. B. Piles--one with chain--9th link. N. B. Direct.

Mud--high water--90 and 4 feet."

"A conundrum, Wigan. What do you make of it?"

He held out the paper to me, a useless thing to do, since he allowed the ray from the torch to wander slowly round the cabin again.

"We must look at the pile with the chain," he muttered in a disconnected way, as though he were thinking of something quite different.

"And at the ninth link of the chain," I said.

"Yes, at the ninth link. A conundrum, Wigan. A----"

He stopped. His eyes had suddenly become fixed upon some object behind me. The electric ray fell slanting close by me, and when I turned I saw that the end of it was under the cushioned seat on one side of the table. The light fell upon a golf club--a rusty mashie.

"That man on the green was one of the crew, Wigan," said Quarles; and then when I picked up the club we looked into each other's eyes.