Miss Mephistopheles by Fergus Hume

So this was the end of it all. The criminal, guilty of the two crimes which had agitated Melbourne for so many months, turned out to be the respected manager of The Never-say-die Insurance Company. After the discovery of his guilt, the affairs of the company were examined, and found to be in a terrible state of confusion. Fenton, aided by Malton, had embezzled large sums of money, and so carefully manipulated the accounts that their defalcations had never been noticed.

It was true that once they were on the verge of discovery unless some of the money was paid back, and this had been accomplished by the robbery of Kitty Marchurst's diamonds. As the two guilty men were dead, the only man who knew anything about the affair was Mr. Villiers, who soon found things made so warm for him that he confessed all he knew about the crime.