пролет - staircase
Рассказ Campbell Nairne - везде переводят как "ступенька"
Хотя, возможно, и лестница - The title is especially related to the first sentence "They went up a short marble staircase" (one stair up). - http://analysesofstories.blogspot.co.uk/2014/04/one-stair-up-by-campbell-nairne.html