On the summit of Montmartre is the rue Norvins. In shape it resembles a donkey's back, and at one particular spot it hugs the accentuated curve of the Butte. The Close of the rue Norvins is situated at number 47. It is separated from the street by a strong iron gate, the porter's lodge being at the side. The Close consists of a series of little dwellings, separated by wooden railings, up which climbing plants grow. Fine trees encircle these abodes with so thick a curtain of leafage that the inhabitants might think themselves buried in the depths of the country. Lodge Number 6 is even more isolated than the others. It consists of a ground floor and a first floor, with an immense studio attached. Three years ago, Number 6 was leased to Monsieur Jacques Dollon, then a student at the Fine Arts School. It has been continuously occupied by the tenant and his sister, Miss Elizabeth Dollon, who has kept house for her brother. For the last fortnight the painter has been alone: his sister, who had gone to Switzerland to convalesce after a long illness, was expected back that same day, or the day following. The reputation of the two young people is considered by their neighbours to be beyond criticism. The artist has led a regular and hard-working life: last year the Salon accorded him a medal of the second class. His sister, an affable and unassuming girl, seemed always much attached to her brother. In that very Bohemian neighbourhood she is highly thought of as a girl of the most estimable character. The Baroness de Vibray visited them frequently, and her motor-car used to attract attention in that high, remote suburb--the wilds of Montmartre. The old lady liked to dress in rather showy colours; she was considered eccentric, but was also known to be good and generous. She took a particular interest in the Dollons, whose family, so it was said, she had known in Provence. Jacques Dollon and his sister highly valued their intimacy with the Baroness de Vibray, who was known all over Paris as a patroness of artists and the arts. _First Verifications_ Already slander and imagination between them had concocted the wildest stories, when Monsieur Agram, the eminent police superintendent of the Clignancourt Quarter, appeared at the entrance to the Close. Accompanied by his secretary, he at once entered Number 6, charging the two policemen, who were assisting him, on no account to allow anyone to enter, excepting the doctor, whom he had at once sent for.