Ну, если выбирать только *одну* книгу, тогда этой книгой были бы "Песни Белерианда"...
...a green grave, and a stone set,
and there there lie the white bones yet
of Felagund, of Finrod's son -
unless that land is changed and gone,
or foundered in unfathomed seas,
while Felagund laughs beneath the trees
in Valinor, and comes no more
to this grey world of tears and war.
