It does not require the skill of a Sherlock Holmes to discover such proceedings on the part of our neighbours. The study of electric lights on gloomy autumn days is wonderfully informing! Number 16 was uninteresting,--only a stupid man and his wife, who looked like a hundred other men and their wives; and who had tiresome silk curtains drawn across the lower panes of their windows, so that it was impossible to obtain a glimpse of the rooms. Number 17, however, more than ever made up for this disappointment, for there lived "The Pretty Lady" beloved by one and all. She was tall, and dark, and young; almost like a girl, and Betty darkly suspected her of being engaged, for she looked so beamingly happy, and was often seen walking about with a tall, handsome man in the shiniest of top-hats. The door of Number 17 was somewhat out of the line of vision, so that it was not always easy to see who went in and out, but the young couple often passed the corner of the Square, and always seemed to be in radiant spirits. Once when the pretty lady was wearing a new coat, Edwin (of course he was Edwin!) fell behind a pace or two to study the effect, and softly clapped his hands in approval. It must be nice, Betty thought wistfully, to be engaged, and have someone who liked you the best of all, and brought you home chocolates and flowers! She was anxious to know who formed the other members of the household, but Jill said there was only an invalid mother, who said, "Go about as much as ever you can, my darling. Don't think about me! The young should always be happy;" and this was accepted by all as a natural and satisfactory explanation. There were no children to be found in the whole length of the terrace. The landlords, no doubt, had too much regard for their white enamel and costly wall-papers to welcome tenants with large families. The "Pampered Pet" in Number 14 was the nearest approach to a child, and she must have been sixteen at least. Her father was a General Somebody out in India, and her mother remained in England to superintend the Darling's education, and see that she did not get her feet wet. As soon as she was eighteen she would be presented at Court, taken out to India, and married to the Viceroy at the end of her first season. The Pet's bedroom was on the third storey of the house, and as its windows faced the gardens of the Square, she had a fancy for leaving them undraped, except for the narrow _brise-bise_ over the lower panes. It probably never occurred to her to remember one little dormer window perched high in the corner house, which of late days had constituted Betty Trevor's domain, and she would have been greatly surprised to know how good a view of her sanctum could be obtained from this vantage- ground, or how much time its mistress gave to enjoying the same. All alone in the dark Betty would kneel on a chair and press her face against the cold panes, staring, staring, muttering to herself--