Margaret Wilmot had promised to become the wife of the man she loved; but she had given that promise very reluctantly, and only upon one condition. The condition was, that, before her marriage with Clement Austin took place, the mystery of her father’s death should be cleared up for ever.

“I cannot be your wife so long as the secret of that cruel deed remains unknown,” she said to Clement. “It seems to me as if I have already been, wickedly neglectful of a solemn duty. Who had my father to love him and remember him in all the world but me? and who should avenge his death if I do not? He was an outcast from society; and people think it a very small thing that, after having led a reckless life, he should die a cruel death. If Henry Dunbar, the rich banker, had been murdered, the police would never have rested until the assassin had been discovered. But who cares what became of Joseph Wilmot, except his daughter? His death makes no blank in the world: except to me — except to me!”

Clement Austin did not forget his promise to do his uttermost towards the discovery of the banker’s guilt. He believed that Henry Dunbar was the murderer of his old servant; and he had believed it ever since that day upon which the banker stole, like a detected thief, out of the house in St. Gundolph Lane.

It was just possible that Henry Dunbar might avoid Joseph Wilmot’s daughter from a natural horror of the events connected with his return to England; but that the banker should resort to a cowardly stratagem to escape from an interview with the girl could scarcely be accounted for, except by the fact of his guilt.

He had an insurmountable terror of seeing this girl, because he was the murderer of her father.

The longer Clement Austin deliberated upon this business the more certainly he came to that one terrible conclusion: Henry Dunbar was guilty. He would gladly have thought otherwise: and he would have been very happy had he been able to tell Margaret Wilmot that the mystery of her father’s death was a mystery that would never be solved upon this earth: but he could not do so; he could only bow his head before the awful necessity that urged him on to take his part in this drama of crime — the part of an avenger.

But a cashier in a London bank has very little time to play any part in life’s history, except that quiet r?le which seems chiefly to consist in locking and unlocking iron safes, peering furtively into mysterious ledgers, and shovelling about new sovereigns as coolly as if they were Wallsend or Clay–Cross coals.

Clement Austin’s life was not an easy one, and he had no time to turn amateur detective, even in the service of the woman ha loved.

He had no time to turn amateur detective so long as he remained at the banking-house in St. Gundolph Lane.

But could he remain there? That question arose in his mind, and took a very serious form. Was it possible to remain in that house when he believed the principal member of it to be one of the most infamous of men?

No; it was quite impossible for him to remain in his present situation. So long as he took a salary from Dunbar, Dunbar and Balderby, he was in a manner under obligation to Henry Dunbar. He could not remain in this man’s service, and yet at the same time play the spy upon his actions, and work heart and soul to drag the dreadful secret of his life into the light of day.

Thus it was that towards the close of the week in which Henry Dunbar, for the first time after his return from India, visited the banking-offices, Clement Austin handed a formal notice of resignation to Mr. Balderby. The cashier could not immediately resign his situation, but was compelled to give his employers a month’s notice of the withdrawal of his services.

A thunderbolt falling upon the morocco-covered writing-table in Mr. Balderby’s private parlour could scarcely have been more astonishing to the junior partner than this letter which Clement Austin handed him very quietly and very respectfully.

There were many reasons why Clement Austin should remain in the banking-house. His father had lived for thirty years, and had eventually died, in the employment of Dunbar and Dunbar. He had been a great favourite with the brothers; and Clement had been admitted into the house as a boy, and had received much notice from Percival. More than this, he had every chance of being admitted ere long to a junior partnership upon very easy terms, which junior partnership would of course be the high-road to a great fortune.

Mr. Balderby sat with the letter open in his hands, staring at the lines before him as if he was scarcely able to comprehend their purport.

“Do you mean this, Austin?” he said at last.

“Yes, sir. Circumstances over which I have no control compel me to offer you my resignation.”

“Have you quarrelled with anybody in the office? Has anything occurred in the house that has made you uncomfortable?”

“No, indeed, Mr. Balderby; I am very comfortable in my position.”

The junior partner leaned back in his chair, and stared at the cashier as if he had been trying to detect the traces of incipient insanity in the young man’s countenance.

“You are comfortable in your position, and yet you — Oh! I suppose the real truth of the matter is, that you have heard of something better, and you are ready to give us the go-by in order to improve your own circumstances?” said Mr. Balderby, with a tone of pique; “though I really don’t see how you can very well be better off anywhere than you are here,” he added, thoughtfully.

“You do me wrong, sir, when you think that I could willingly leave you for my own advantage,” Clement answered, quietly. “I have no better engagement, nor have I even a prospect of any engagement.”

“You haven’t!” exclaimed the junior partner; “and yet you throw away such a chance as only falls to the lot of one man in a thousand! I don’t particularly care about guessing riddles, Mr. Austin; perhaps you’ll be kind enough to tell me frankly why you want to leave us?”

“I regret to say that it is impossible for me to do so, sir,” replied the cashier; “my motive for leaving this house, which is a kind of second home to me, is no frivolous one, believe me. I have weighed well the step I am about to take, and I am quite aware that I sacrifice very excellent prospects in throwing up my present situation. But the reason of my resignation must remain a secret; for the present at least. If ever the day comes when I am able to explain my conduct, I believe that you will give me your hand, and say to me, ‘Clement Austin, you only did your duty.’”

“Clement,” said Mr. Balderby, “you are an excellent fellow; but you certainly must have got some romantic crotchet in your head, or you could never have thought of writing such a letter as this. Are you going to be married? Is that your reason for leaving us? Have you fascinated some wealthy heiress, and are you going to retire into splendid slavery?”

“No, sir. I am engaged to be married; but the lady whom I hope to call my wife is poor, and I have every necessity to be a working man for the rest of my life.”

“Well, then, my dear fellow, it’s a riddle; and, as I said before, I’m not good at guessing enigmas. There, my boy; go home and sleep upon this; and come back to me to-morrow morning, and tell me to throw this stupid letter in the fire — that’s the wisest thing you can do. Good night.”

But, in spite of all that Mr. Balderby could say, Clement Austin steadily adhered to his resolution. He worked early and late during the month in which he remained at his post, preparing the ledgers, balancing accounts, and making things straight and easy for the new cashier. He told Margaret Wilmot of what he had done, but he did not tell her the extent of the sacrifice which he had made for her sake. She was the only person who knew the real motive of his conduct, for to his mother he said very little more than he had said to Mr. Balderby.

“I shall be able to tell you my motives for leaving the banking-house at some future time, dear mother,” he said; “until that time I can only entreat you to trust me, and to believe that I have acted for the best.”

“I do believe it, my dear,” answered the widow, cheerfully; “when did you ever do anything that wasn’t wise and good?”

Her only son, Clement, was the god of this simple woman’s idolatry; and if he had seen fit to turn her out of doors, and ask her to beg by his side in the streets of the city, I doubt if she would not have imagined some hidden wisdom lurking at the bottom of his apparently irrational proceedings. So she made no objection to his abandoning his desk in the house of Dunbar, Dunbar, and Balderby.

“We shall be poorer, I suppose, Clem,” Mrs. Austin said; “but that’s very little consequence, for your dear father left me so comfortably off that I can very well afford to keep house for my only son; and I shall have you more at home, dear, and that will indeed be happiness.”

But Clement told his mother that he had some very important business on hand just then, which would occupy him a good deal; and indeed the first step necessary would be a journey to Shorncliffe, in Warwickshire.

“Why, that’s where you went to school, Clem!”

“Yes, mother.”

“And it’s near Mr. Percival Dunbar — or, at least, Mr. Dunbar’s country house.”

“Yes, mother,” answered Clement. “Now the business in which I am engaged is — is rather of a difficult nature, and I want legal help. My old schoolfellow, Arthur Lovell, who is as good a fellow as ever breathed, has been educated for the law, and is now a solicitor. He lives at Shorncliffe with his father, John Lovell, who is also a solicitor, and a man of some standing in the county. I shall run down to Shorncliffe, see my old friend, and get has advice; and if you’ll bring Margaret down for a few days’ change of air, we’ll stop at the dear old Reindeer, where you used to come, mother, when I was at school, and where you used to give me such jolly dinners in the days when a good dinner was a treat to a hungry schoolboy.”

Mrs. Austin smiled at her son; she smiled tenderly as she remembered his bright boyhood. Mothers with only sons are not very strong-minded. Had Clement proposed a trip to the moon, she would scarcely have known how to refuse him her company on the expedition.

She shivered a little, and looked rather doubtfully from the blazing; fire which lit up the cozy drawing-room to the cold grey sky outside the window.

“The beginning of January isn’t the pleasantest time in the year for a trip into the country, Clem, dear,” she said; “but I should certainly be very lonely at home without you. And as to poor Madge, of course it would be a great treat to her to get away from her pupils and have a peep at the genuine country, even though there isn’t a single leaf upon the trees. So I suppose I must say yes. But do tell me all about this business there’s a dear good boy.”

Unfortunately the dear good boy was obliged to tell his mother that the business in question was, like his motive for resigning his situation, a profound secret, and that it must remain so for some time to come.

“Wait, dear mother,” he said; “you shall know all about it by-and-by. Believe me, when I tell you that it’s not a very pleasant business,” he added, with a sigh.

“It’s not unpleasant for you, I hope, Clement?”

“It isn’t pleasant for any one who is concerned in it, mother,” answered the young man, thoughtfully; “it’s altogether a miserable business; but I’m not concerned in it as a principal, you know, dear mother; and when it’s all over we shall only look back upon it as the passing of a black cloud over our lives, and you will say that I have done my duty. Dearest mother, don’t look so puzzled,” added Clement; “this matter must remain a secret for the present. Only wait, and trust me.”

“I will, my dear boy,” Mrs. Austin said, presently. “I will trust you with all my heart; for I know how good you are. But I don’t like secrets, Clem; secrets always make me uncomfortable.”

No more was said upon this subject, and it was arranged by-and-by that Mrs. Austin and Margaret should prepare to start for Warwickshire at the beginning of the following week, when Clement would be freed from all engagements to Messrs. Dunbar, Dunbar, and Balderby.

Margaret had waited very patiently for this time, in which Clement would be free to give her all his help in that awful task which lay before her — the discovery of Henry Dunbar&rsqu............