ten o'clock
She read the lines that follow : `` Unforeseen events force me , Sir Giles , to run a serious risk . I must speak to you , and it must not be by daylight . My one hope of safety is in darkness . Meet me at the first milestone , on the road to Garvan , when the moon sets at ten o'clock to-night . No need to mention your name . The password is : _ Fidelity . '' _ `` Do you mean to go ? ''