Unions between immortal Elves and mortal Men were rare in Middle-earth: the fates of these two kindreds are very different to be interwoven easily. When Elves and Men did intermarry, it was usually for a high, noble purpose, but had a sorrowful end.
Very few readers are left unimpressed when they, together with Frodo, Sam, Merry and Pippin, lose their way in the fog on the Barrow-downs and become trapped in the mound by the Barrow-wights. These creatures are horrible and horrifying, and appear even more so as we do not fully understand what they are exactly. So, what are these wights and where do they come from?