The Green is how de Lint (Dreams Underfoot, The Little Country, Spiritwalk, etc.) recasts Faerie, accessible to those with the (now many times diluted) Summerblood that confers magical abilities. Young Angharad is thrice magical: a witch through her Summerblood, born and raised a tinker, and a harper after an encounter with a wizard dwelling within a tree. The sands of a nearby desert momentarily retreat to expose a puzzle-box, an ancient artifact of vast and evil power; the Lords of the Green charge Angharad with locating and destroying the puzzle-box, lest it annihilate the Green itself. After various adventures--and aided by an assassin who seeks vengeance upon the aristocracy--Angharad prepares to make the ultimate sacrifice; but matters do not go entirely according to plan.... Thin as tissue paper, insubstantial as air.