ten
o’clock
You realise that , I am sure , and you will not persist in returning to your selfish solitude . '' Hamel 's eyes were fixed a little longingly upon some of the volumes with which the table was covered . `` You must not think me ungrateful or churlish , Mr. Fentolin , '' he begged . `` I have a habit of keeping promises which I make to myself , and to-night I have made myself a promise that I will be back at the Tower by ten o'clock . '' `` You are obdurate ? '' Mr. Fentolin asked softly . `` I am afraid I am . ''