My husband recommended that I read this small 50 page book. The tale is 'retold in modern prose' by Jessie L. Weston.
A great green stranger appears in the court of King Arthur during the New Year's feast. He puts a challenge out that anyone can cut his head off as long as in a year he gets to give the same back. Sir Gawain volunteers.
Follow the story to find out what happens. It will only take you a little time to read this tale from the 14th century and you can say you've read one of the great Arthurian legends.