five o'clock
I 'll see this out if it means the end of everything . '' As I spoke there came a sharp `` ting '' from the clock on the mantelpiece , and looking up I saw that it was half-past four . `` By Gad , Tommy , '' I added , `` I must go from here , though . I 've got to be back at Edith Terrace by five o'clock , or I shall miss this mysterious visitor . '' `` You 're coming back here afterwards ? '' he asked . I nodded .