"Then how did Hazel Rath obtain possession of his revolver?"

"That is what I do not know. I must tell you that the day before the murder some of our guests spent a wet afternoon amusing themselves shooting at a target in the gun-room. They were using Captain Nepcote's revolver. When I told Detective Caldew this, he came to the conclusion that Nepcote must have left it there after the shooting, and Hazel Rath found it when she went to look for a weapon."

"I see. And what is your own opinion?"

"I do not believe it for one moment."

"Why not?"

"For one thing, it strikes me as unlikely that Nepcote would forget his revolver when leaving the gun-room. In any case, the police are taking too much for granted in a.s.suming, without inquiry, that he did. Caldew told me that the question of the ownership of the revolver did not affect the case against Hazel Rath in the slightest degree."

"Do you know whether the revolver was seen by anybody between the time of Captain Nepcote's departure and its discovery in Hazel Rath's possession?"

"I understand that it was not."

"Do you know whether Captain Nepcote took it from the gun-room after the target shooting?"

"That I cannot say. I left the gun-room before the shooting was finished."

"Let me see if I thoroughly understand the position," said Colwyn. "In your narrative of the events of the murder you stated that all the members of the household and the guests were in the dining-room when the murder was committed. Nepcote was not there because he had returned to London during the afternoon. Nevertheless, it was with his revolver that your wife was shot."

"That is correct," said Phil.

"If Nepcote did not leave his revolver in the gun-room the police theory would be upset on an important point, and the case would take on a new aspect. Have you any suspicions that you have not confided to me?"

"I cannot say that I have any particular suspicions," the young man replied. "I do not know what to think, but I should like to have this terrible mystery cleared up. I have not seen Nepcote since the day of the murder to ask him about the revolver. He said good-bye to me before he left, and I understood that he had received a wire from the War Office recalling him to the front. After the murder I was taken ill, as I have told you, and it was not until to-day that I was informed of what happened during my illness."

"I am inclined to agree with you that the case wants further investigation," said Colwyn.

"Then will you undertake it?" asked Phil.

The feeling that he was face to face with one of the deepest mysteries of his career acted as an irresistible call to Colwyn's intellect. He consulted the leaves of his engagement book.

"Yes, I will come," he said.

Phil glanced at his watch.

"I am afraid we can hardly catch the last train to Heredith," he said.

"We will drive down in my car," said Colwyn. "Please excuse me for a few moments."

He left the room, and returned in a few moments fully equipped for the journey.

"Let us start," he said.

His tone was decided and imperative, his movements quick and full of energy. That was wholly like him, once he had decided on his course.

CHAPTER XVI

It was so late that Ludgate Circus was deserted except for a ramshackle cab with a drunken driver pouring forth a hoa.r.s.e story of a mean fare to a sleepy policeman leaning against a lamp post. The sight of two gentlemen on foot when all 'buses had stopped running for the night raised fleeting hopes in the cabman's pessimistic breast, and changed the flow of his narrative into a strident appeal for hire, based on the plea, which he called on the policeman to support, that he hadn't turned a wheel that night, and amplified with a profanity which only the friendliest understanding with the policeman could have permitted him to pour forth without fear of consequences.

He intimated his readiness to drive them anywhere between the Angel on one side of London and the Elephant on the other for three bob, or, being a bit of a sport, would toss them to make it five bob or nothing. The boundaries, he explained in a husky parenthesis, were fixed not so much by his own refusal to travel farther afield as by his horse's unwillingness to go into the blasted suburbs. As his importunities pa.s.sed unregarded he d.a.m.ned them both with the terrible earnestness of his cla.s.s, and rumbled back into his dislocated story with the languid policeman.

Colwyn kept his car in a garage off the Bridge Street archway. Thither they proceeded, and waited while the car was got ready for the roads by a shock-headed man who broke the stillness of the night with prodigious yawns, and then stood blinking like an owl as he leaned against the yard gates watching the detective backing the car down the declivity of the pa.s.sage into Bridge Street. Before they had reached it, he banged the gates behind him with another tremendous yawn, and went back to his interrupted slumber in the interior of a limousine.

It was a fine night for motoring. There was a late moon, and the earlier rain had laid the dust and left the roads in good condition. Colwyn cautiously threaded the crooked tangle of narrow streets and sharp corners between Blackfriars and Victoria, but as the narrow streets opened into broader ways he increased the speed of his high-powered car, and by the time London was left behind for the quiet meadows and autumn-scented woods they were racing along the white country roads at a pace which caused the roadside avenues of trees to slide past them like twin files of soldiers on the double.

Mile after mile slipped away in silence. Beyond an occasional direction of route by Phil there was no conversation between the two men in the car. Phil sat back looking straight in front of him, apparently absorbed in thought, and the car occupied Colwyn's attention. When they reached the heights above Heredith, Phil pointed to the green flats beneath and the old house in a shroud of mist.

"That is the moat-house," he said. "The carriage drive is from the village side." And with that brief indication that they were nearing their journey's end he once more settled back into silence.

Colwyn brought the car down from the rise into the sleeping village, and a few minutes later he was driving up the winding carriage way between the rows of drooping trees. On the other side of the woods the moat-house came into view. The moonlight gleamed on the high-pitched red roof, and drenched the garden in whiteness, but the mist which rose from the waters of the moat swathed the walls of the house like a cerement. The moon, crouching behind the umbrageous trees of the park, cast a heavy shadow on the lawn, like a giant's hand menacing the home of murder.

Late as the hour was, Tufnell was up awaiting their arrival, with a light supper and wine set ready in a small room off the library. Phil had telephoned from Colwyn's rooms to say that he was returning with the detective, and the butler, as he helped them off with their coats, said that rumours of a railway accident had reached the moat-house, causing Miss Heredith much anxiety until she received the telephone message.

Colwyn and Phil sat down to supper, with the butler in a.s.siduous attendance. The meal was a slight and silent one. Phil kept a host's courteous eye on his guest's needs, but showed no inclination for conversation, and Colwyn was not the man to talk for talking's sake. When they had finished Phil asked the butler which room Mr. Colwyn was to occupy.

"Miss Heredith has had the room next to Sir Philip's prepared, sir."

"No doubt you are tired, Mr. Colwyn, and would like to retire," Phil said.

"Thank you, I should. I travelled from Scotland last night, and had very little sleep."

"In that case you will be glad to go to bed at once. I will show you to your room," said the young man, rising from the table.

"Please do not bother," replied Colwyn, noting the worn air and white face of the other. "You look done up yourself."

"Miss Heredith was anxious that you should retire as soon as you could, sir, so as to get as much rest as possible after your journey," put in the butler, with the officious solicitude of an old servant.

"Then I shall leave you in Tufnell's care," said Phil, holding out his hand as he said good night.

He went out of the room, and Colwyn was left with the old butler.

"Is it your wish to retire now?" the latter inquired.

"I shall be glad to do so, if you will show me to my bedroom."

The butler bowed gravely, and escorted Colwyn upstairs to his bedroom.

"This is your room, sir. I hope you will be comfortable."

"I feel sure that I shall," replied Colwyn, with a glance round the large handsome apartment.

"Your dressing-room opens off it, sir."

"Thank you. Good night."

"Good night, sir." The butler turned hesitatingly towards the door, as though he wished for some excuse to linger, but could think of nothing to justify such a course. He walked out of the room into the pa.s.sage, and then turned suddenly, the light through the open doorway falling on his sharpened old features and watchful eyes.