One piercing cold winter’s day there came knocking at the widow’s door—a young man. Winter days, when the ice of January is refrozen by the wind of February, are very cold at Saratoga Springs. In these days there was not often much to disturb the serenity of Mrs. Bell’s house; but on the day in question there came knocking at the door—a young man. Mrs. Bell kept an old domestic, who had lived with them in those happy Albany days. Her name was Kate O’Brien, but though picturesque in name she was hardly so in person. She was a thick-set, noisy, good-natured old Irishwoman, who had joined her lot to that of Mrs. Bell when the latter first began housekeeping, and knowing when she was well off; had remained in the same place from that day forth. She had known Hetta as a baby, and, so to say, had seen Susan’s birth. “And what might you be wanting, sir?” said Kate O’Brien, apparently not quite pleased as she opened the door and let in all the cold air. “I wish to see Mrs. Bell. Is not this Mrs. Bell’s house?” said the young man, shaking the snow from out of the breast of his coat. He did see Mrs. Bell, and we will now tell who he was, and why he had come, and how it came to pass that his carpet-bag was brought down to the widow’s house and one of the front bedrooms was prepared for him, and that he drank tea that night in the widow’s parlour. His name was Aaron Dunn, and by profession he was an engineer. What peculiar misfortune in those days of frost and snow had befallen the line of rails which runs from Schenectady to Lake Champlain, I never quite understood. Banks and bridges had in some way come to grief, and on Aaron Dunn’s shoulders was thrown the burden of seeing that they were duly repaired. Saratoga Springs was the centre of these mishaps, and therefore at Saratoga Springs it was necessary that he should take up his temporary abode. Now there was at that time in New York city a Mr. Bell, great in railway matters—an uncle of the once thriving but now departed Albany lawyer. He was a rich man, but he liked his riches himself; or at any rate had not found himself called upon to share them with the widow and daughters of his nephew. But when it chanced to come to pass that he had a hand in despatching Aaron Dunn to Saratoga, he took the young man aside and recommended him to lodge with the widow. “There,” said he, “show her my card.” So much the rich uncle thought he might vouchsafe to do for the nephew’s widow. Mrs. Bell and both her daughters were in the parlour when Aaron Dunn was shown in, snow and all. He told his story in a rough, shaky voice, for his teeth chattered; and he gave the card, almost wishing that he had gone to the empty big hotel, for the widow’s welcome was not at first quite warm.