midnight
He then went back to the Criminal Investigation Department , took half a dozen men and packed them off with the necessary instructions . At seven o'clock in the evening , the last of these men returned and brought good news with him . A certain M. Prévailles , a subscriber to the _ Turf _ , occupied an entresol flat on the Quai des Augustins . On the previous evening , he left his place , wearing a fur coat , took his letters and his paper , the _ Turf Illustré _ , from the porter 's wife , walked away and returned home at midnight . This M. Prévailles wore a single eyeglass . He was a regular race-goer and himself owned several hacks which he either rode himself or jobbed out . The inquiry had taken so short a time and the results obtained were so exactly in accordance with Lupin 's predictions that Ganimard felt quite overcome on hearing the detective 's report .