If he discovered anything, his discoveries were entirely negative, and served only to deepen the mystery of the case. As Mr. Snyder had said, there was no chimney, and n.o.body could have entered through the locked door.

There remained the window. It was small, and apprehensiveness, perhaps, of the possibility of burglars, had caused the proprietress to make it doubly secure with an iron bar. No human being could have squeezed his way through it.

It was late that night that he wrote and dispatched to headquarters the report which had amused Mr. Snyder.

V

Two days later Mr. Snyder sat at his desk, staring with wide, unbelieving eyes at a telegram he had just received. It read as follows:

HAVE SOLVED GUNNER MYSTERY. RETURNING.... OAKES.

Mr. Snyder narrowed his eyes and rang the bell. "Send Mr. Oakes to me directly he arrives," he said.

He was pained to find that his chief emotion was one of bitter annoyance. The swift solution of such an apparently insoluble problem would reflect the highest credit on the Agency, and there were picturesque circ.u.mstances connected with the case which would make it popular with the newspapers and lead to its being given a great deal of publicity.

Yet, in spite of all this, Mr. Snyder was annoyed. He realized now how large a part the desire to reduce Oakes' self-esteem had played with him. He further realized, looking at the thing honestly, that he had been firmly convinced that the young man would not come within a mile of a reasonable solution of the mystery. He had desired only that his failure would prove a valuable educational experience for him. For he believed that failure at this particular point in his career would make Oakes a more valuable a.s.set to the Agency. But now here Oakes was, within a ridiculously short s.p.a.ce of time, returning to the fold, not humble and defeated, but triumphant. Mr. Snyder looked forward with apprehension to the young man's probable demeanor under the intoxicating influence of victory.

His apprehensions were well grounded. He had barely finished the third of the series of cigars, which, like milestones, marked the progress of his afternoon, when the door opened and young Oakes entered. Mr. Snyder could not repress a faint moan at the sight of him. One glance was enough to tell him that his worst fears were realised.

"I got your telegram," said Mr. Snyder.

Oakes nodded. "It surprised you, eh?" he asked.

Mr. Snyder resented the patronizing tone of the question, but he had resigned himself to be patronized, and keep his anger in check.

"Yes," he replied, "I must say it did surprise me. I didn't gather from your report that you had even found a clue. Was it the Indian theory that turned the trick?"

Oakes laughed tolerantly. "Oh, I never really believed that preposterous theory for one moment. I just put it in to round out my report. I hadn't begun to think about the case then--not really think."

Mr. Snyder, nearly exploding with wrath, extended his cigar-case.

"Light up, and tell me all about it," he said, controlling his anger.

"Well, I won't say I haven't earned this," said Oakes, puffing away. He let the ash of his cigar fall delicately to the floor--another action which seemed significant to his employer. As a rule, his a.s.sistants, unless particularly pleased with themselves, used the ashtray.

"My first act on arriving," Oakes said, "was to have a talk with Mrs.

Pickett. A very dull old woman."

"Curious. She struck me as rather intelligent."

"Not on your life. She gave me no a.s.sistance whatever. I then examined the room where the death had taken place. It was exactly as you described it. There was no chimney, the door had been locked on the inside, and the one window was very high up. At first sight, it looked extremely unpromising. Then I had a chat with some of the other boarders. They had nothing of any importance to contribute. Most of them simply gibbered.

I then gave up trying to get help from the outside, and resolved to rely on my own intelligence."

He smiled triumphantly. "It is a theory of mine, Mr. Snyder, which I have found valuable that, in nine cases out of ten, remarkable things don't happen."

"I don't quite follow you there," Mr. Snyder interrupted.

"I will put it another way, if you like. What I mean is that the simplest explanation is nearly always the right one. Consider this case. It seemed impossible that there should have been any reasonable explanation of the man's death. Most men would have worn themselves out guessing at wild theories. If I had started to do that, I should have been guessing now.

As it is--here I am. I trusted to my belief that nothing remarkable ever happens, and I won out."

Mr. Snyder sighed softly. Oakes was ent.i.tled to a certain amount of gloating, but there could be no doubt that his way of telling a story was downright infuriating.

"I believe in the logical sequence of events. I refuse to accept effects unless they are preceded by causes. In other words, with all due respect to your possibly contrary opinions, Mr. Snyder, I simply decline to believe in a murder unless there was a motive for it. The first thing I set myself to ascertain was--what was the motive for the murder of Captain Gunner? And, after thinking it over and making every possible inquiry, I decided that there was no motive. Therefore, there was no murder."

Mr. Snyder's mouth opened, and he obviously was about to protest. But he appeared to think better of it and Oakes proceeded: "I then tested the suicide theory. What motive was there for suicide? There was no motive. Therefore, there was no suicide."

This time Mr. Snyder spoke. "You haven't been spending the last few days in the wrong house by any chance, have you? You will be telling me next that there wasn't any dead man."

Oakes smiled. "Not at all. Captain John Gunner was dead, all right. As the medical evidence proved, he died of the bite of a cobra. It was a small cobra which came from Java."

Mr. Snyder stared at him. "How do you know?"

"I do know, beyond any possibility of doubt."

"Did you see the snake?"

Oakes shook his head.

"Then, how in heaven's name----"

"I have enough evidence to make a jury convict Mr. Snake without leaving the box."

"Then suppose you tell me this. How did your cobra from Java get out of the room?"

"By the window," replied Oakes, impa.s.sively.

"How can you possibly explain that? You say yourself that the window was high up."

"Nevertheless, it got out by the window. The logical sequence of events is proof enough that it was in the room. It killed Captain Gunner there, and left traces of its presence outside. Therefore, as the window was the only exit, it must have escaped by that route. It may have climbed or it may have jumped, but somehow it got out of that window."

"What do you mean--it left traces of its presence outside?"

"It killed a dog in the backyard behind the house," Oakes said. "The window of Captain Gunner's room projects out over it. It is full of boxes and litter and there are a few stunted shrubs scattered about. In fact, there is enough cover to hide any small object like the body of a dog. That's why it was not discovered at first. The maid at the Excelsior came on it the morning after I sent you my report while she was emptying a box of ashes in the yard. It was just an ordinary stray dog without collar or license. The a.n.a.lyst examined the body, and found that the dog had died of the bite of a cobra."

"But you didn't find the snake?"

"No. We cleaned out that yard till you could have eaten your breakfast there, but the snake had gone. It must have escaped through the door of the yard, which was standing ajar. That was a couple of days ago, and there has been no further tragedy. In all likelihood it is dead. The nights are pretty cold now, and it would probably have died of exposure."

"But, I just don't understand how a cobra got to Southampton," said the amazed Mr. Snyder.

"Can't you guess it? I told you it came from Java."

"How did you know it did?"

"Captain Muller told me. Not directly, but I pieced it together from what he said. It seems that an old shipmate of Captain Gunner's was living in Java. They corresponded, and occasionally this man would send the captain a present as a mark of his esteem. The last present he sent was a crate of bananas. Unfortunately, the snake must have got in unnoticed. That's why I told you the cobra was a small one. Well, that's my case against Mr. Snake, and short of catching him with the goods, I don't see how I could have made out a stronger one. Don't you agree?"

It went against the grain for Mr. Snyder to acknowledge defeat, but he was a fair-minded man, and he was forced to admit that Oakes did certainly seem to have solved the impossible.