Suddenly, in the midst of his musings, a sound fell on the detective's ear; a voice he had heard before, low and musical, and curiously resonant. He looked in the direction from which it came and saw two people standing together, a little apart, in the crowd of those waiting at the water's edge for a craft to carry them ashore. There were only two or three boats; and, though the ghillies bent to their oars with a will, every one could not cross the narrow channel which divided the island from the mainland at one and the same time. A group had already formed on the beach of those who were not the first to get away, and among these were the two figures that had attracted Gimblet's attention.
They were two ladies, who stood watching the boats, which had landed their passengers and were now returning empty.
The nearest to him, a tall woman of ample proportions, was visibly affected by the ceremony she had just witnessed, and dabbed from time to time at her eyes with a handkerchief.
But it was her companion who interested him. She was short and slender; her slightness accentuated by the long dress of black cloth and the small plain hat of the same colour which she wore. A thick black veil hung down over her face and obscured it from his view, but about her general appearance there was something strangely familiar. In a moment Gimblet knew what it was, and where he had seen her before. He had caught sight, in her hand, of a little bag of striped black satin with purple pansies embroidered at intervals upon it. Just such a bag had lain upon the table of his flat in Whitehall a few weeks ago, on the day when its owner had stolen the envelope entrusted to him by Lord Ashiel.
"It is she," breathed the detective, "the widow!"
And for one wild moment he was on the point of accosting her and demanding his missing letter. Wiser counsels prevailed, however, and he moved away to the other side of the small group of mourners gathered on the stony beach.
When he ventured to look at her again, it was over the shoulder of a stalwart Highlander, whose large frame effectually concealed all of the little detective except his hat and eyes. A further surprise was in store for him. The lady had lifted her veil and displayed the features of the girl he had watched in the library on the preceding night.
Gimblet had seen enough. He turned away, and found Juliet at his elbow.