one o'clock precisely
There was something in the air , he felt , which he did not understand . He would not have admitted it to himself , but he more than half divined the truth . The vacant seat in his wife 's carriage was filled that night by the Baron de Grost . * * * * * At one o'clock precisely Monsieur de Lamborne returned to his house , and found de Grost gazing with obvious respect at the ponderous safe let into the wall . `` A very fine affair -- this , '' he remarked , motioning with his head towards it . `` The best of its kind , '' Monsieur de Lamborne admitted . `` No burglar yet has ever succeeded in opening one of its type .