about eleven o'clock
He tells her that he has , on a sudden inspiration , sent Marlowe in the car to Southampton ; that he has sent him to bring back some important information from a man leaving for Paris by the steamboat that morning . Why these details from a man who had long been uncommunicative to his wife , and that upon a point scarcely likely to interest her ? Why these details _ about Marlowe _ ? Having taken my story so far , I now put forward the following definite propositions : that between a time somewhere about ten , when the car started , and a time somewhere about eleven , Manderson was shot -- probably at a considerable distance from the house , as no shot was heard ; that the body was brought back , left by the shed , and stripped of its outer clothing , while the car was left in hiding somewhere at hand ; that at some time round about eleven o'clock a man who was not Manderson , wearing Manderson 's shoes , hat and jacket , entered the library by the garden-window ; that he had with him Manderson 's black trousers , waistcoat and motor-coat , the denture taken from Manderson 's mouth , and the weapon with which he had been murdered ; that he concealed these , rang the bell for the butler , and sat down at the telephone with his hat on and his back to the door ; that he was occupied with the telephone all the time Martin was in the room ; that on going up to the bedroom-floor he quietly entered Marlowe 's room and placed the revolver with which the crime had been committed -- Marlowe 's revolver -- in the case on the mantel-piece from which it had been taken ; and that he then went to Manderson 's room , placed Manderson 's shoes outside the door , threw Manderson 's garments on a chair , placed the denture in the bowl by the bedside , and selected a suit of clothes , a pair of shoes and a tie from those in the bedroom . Here I will pause in my statement of this man 's proceedings to go into a question for which the way is now sufficiently prepared . _ Who was the false Manderson ? _ Reviewing what was known to me , or might almost with certainty be surmised , about that person , I set down the following five conclusions : -LRB- 1 -RRB- He had been in close relations with the dead man .