ten o’clock
`` Very good , sir ! '' `` Mix me a sleeping draught , Duson . I need rest . See that I am not disturbed until ten o'clock to-morrow morning . '' At precisely ten o'clock on the following morning Duson brought chocolate , which he had prepared himself , and some dry toast to his master 's bedside . Upon the tray was a single letter . Mr. Sabin sat up in bed and tore open the envelope .