The sixth book in Malory’s compilation tells how the knights of the Round Table set out on a quest to find the Holy Grail. Lancelot’s son by Elaine, Sir Galahad, finds the cup and is transported to heaven.
Malory uses this book as a moral lesson. Lancelot fails in the quest because he is in love with another man’s wife. Gawain (the eldest and head of the Orkney brothers) fails because he is not deeply religious and does not follow the mysterious signs given to him. Only Galahad, who is deeply religious and virtuous, succeeds.