ten o'clock
You and I both know that there are weapons in this place which can be made use of by persons wholly without scruples , which are scarcely available at home . I want you to keep your eyes open . I have very few friends here whom I can wholly trust . It is my purpose to call in here every morning at ten o'clock for my letters , and if I fail to arrive within half-an-hour of that time without having given you verbal notice , something will have happened to me . You understand what I mean ? '' `` You mean that you are threatened with assassination ? '' the manager asked gravely .