midnight
`` We have been obliged to meet secretly , and we have frequently walked , in the evening , in the grove back of St. Agnes ' Hospital . `` We were there Monday evening , and we remained much later than we should have done . We had many things to talk about . `` It must have been midnight when we left the place . As we were walking slowly up one of the paths we became aware that a man was approaching from behind us . `` Not wishing to be seen , we stepped aside among the trees and waited . `` The man came on up the path , and by the moonlight which struggled through the branches of the trees we saw that he was carrying a great sack .