Will o' the Wisp

'[...] Your rendering of Loch Lomond will lure him out. We know how readily he responds to that fine old song. I see your role in this affair as a sort of blend of Lorelei and Will–o'–the–Wisp. You get Dunstable out with your siren singing, and you keep him out by flitting ahead of him through the darkness. [...]'

Uncle Fred in the Springtime. Chapter 18