half past eleven
I will watch for a while , however , and you can go to sleep . '' She went to sleep , and I watched . I lay till half past eleven with my eyes staring at the dark , wide awake and undisturbed and triumphant . At half past eleven I must confess that I heard a singular sound . Something whistled at the keyhole . It could not have been the wind , by the way , for there was no wind that night . Something else than the wind whistled in at the keyhole , sighed through into the room as much like a long-drawn breath as anything , and fell with a slight clink upon the floor .