The arch of the leaden sky seemed to contract above the tree-tops in the park, shutting in the earth as if with a roof of hot iron, after the fashion of those cunningly-contrived metal torture-chambers which we read of; but the rain had not yet come.
"What can take her into the garden on such an evening as this?" thought Mrs. Powell, as she watched the white dress receding in the dusky twilight. "It will be dark in ten minutes, and she is not usually so fond of going out alone."
The ensign's widow laid down the book in which she had appeared so deeply interested, and went to her own room, where she selected a comfortable gray cloak from a heap of primly folded garments in her capacious wardrobe. She muffled herself in this cloak, hurried downstairs with a soft but rapid step, and went out into the garden through a little lobby near John Mellish's room. The blinds in the squire's sanctum were not drawn down, and Mrs. Powell could see the master of the house bending over his paper under the light of a reading lamp, with the rheumatic trainer seated by his side. It was by this time quite dark, but Aurora's white dress was faintly visible upon the other side of the lawn.
Mrs. Mellish was standing beside the little iron gate when the ensign's widow emerged from the house. The white dress was motionless for some time, and the pale watcher, lurking under the shade of a long verandah, began to think that her trouble was wasted, and that perhaps, after all, Aurora had no special purpose in this evening ramble.
Mrs. Walter Powell felt cruelly disappointed. Always on the watch for some clue to the secret whose existence she had discovered, she had fondly hoped that even this unseasonable ramble might be some link in the mysterious chain she was so anxious to fit together. But it appeared that she was mistaken. The unseasonable ramble was very likely nothing more than one of Aurora's caprices—a womanly foolishness signifying nothing.
No! The white dress was no longer motionless, and in the unnatural stillness of the hot night Mrs. Powell heard the distant scrooping noise of a hinge revolving slowly, as if guided by a cautious hand. Mrs. Mellish had opened the iron gate, and had passed to the other side of the invisible barrier which separated the gardens from the Park. In another moment she had disappeared under the shadow of the trees which made a belt about the lawn.
Mrs. Powell paused, almost terrified by her unlooked-for discovery.
What, in the name of all that was darkly mysterious, could Mrs. Mellish have to do between nine and ten o'clock on the north side of the Park—the wildly kept, deserted north side, in which, from year's end to year's end, no one but the keepers ever walked?
The blood rushed hotly up to Mrs. Powell's pale face, as she suddenly remembered that the disused, dilapidated lodge upon this north side had been given to the new trainer as a residence. Remembering this was nothing, but remembering this in connection with that mysterious letter signed "A." was enough to send a thrill of savage, horrible joy through the dull veins of the dependent. What should she do? Follow Mrs. Mellish, and discover where she was going? How far would this be a safe thing to attempt?
She turned back and looked once more through the window of John's room. He was still bending over the papers, still in as apparently hopeless confusion of mind. There seemed little chance of his business being finished very quickly. The starless night and her dark dress alike sheltered the spy from observation.