The Silent House by Fergus Hume

Two years after the discovery of Rhoda's guilt, Mr. and Mrs. Denzil were seated in the garden of Berwin Manor. It was a perfect summer evening, at the sunset hour, something like that evening when, in the same garden, almost at the same time, Lucian had asked Diana to be his wife. But between then and now twenty-four months had elapsed, and many things had taken place of more or less importance to the young couple.

The mystery of Clear's death had been solved; Lydia had been set free as innocent of crime; her father, found guilty of conspiracy to obtain the assurance money, had been condemned to a long term of imprisonment, and, what most concerned Lucian and Diana, Mark Vrain had really and truly gone the way of all flesh.