10 o'clock
`` Listen . It 's true that we have many agents abroad , but some of them have fallen under suspicion and consequently will be of no further value . We need more such men who have lived in America and know the customs , and also will not be suspected . By the way , have you an appointment for 10 o'clock ? '' `` Why , no , '' said Hal . `` Why ? '' `` Will you go with me at that hour ? ''