About four o'clock
I felt myself bound to go through every stage of her illness , dwelling upon all her sufferings , and thinking of her as under careless or unskilled attendance , with no friend at hand to take care of her . She ought not to have died , with her perfect constitution . If I had been there she should not have died . About four o'clock Jack tapped softly upon the wall between our bedrooms -- it was a signal we had used when we were boys -- as though to inquire if I was all right ; but it was quiet enough not to wake me if I were asleep . It seemed like the friendly `` Ahoy ! '' from a boat floating on the same dark sea . Jack was lying awake , thinking of me as I was thinking of Olivia .