'Know that there were three tables there. The first was the Round Table, with King Arthur as companion and lord. The second was called the Table of Errant Companions. Those of the third table never left court and did not go on quests or in search of adventures. These knights were called the Less Valued Knights.' Sir Humphrey du Val of the Table of Less Valued Knights - Camelot's least prestigious table, boringly rectangular in shape and with one leg shorter than the other so that it always has to be propped up with a folded napkin to stop it from rocking - has been banned by King Arthur from going on quests, and hasn't left the castle in fifteen years. He's tempted out of his imposed retirement by Elaine, who is looking for her kidnapped fiance. She appears to be the classic Damsel in Distress, but turns out to have a big secret to hide. Across the border in Puddock, the new young queen, Martha, is appalled to be married off against her will to the odious Prince Edwin of Tuft. She disguises herself as a boy and runs away, but doesn't get very far before the Locum of the Lake - standing in for the full-time Lady - intercepts her with some startling news: Martha's brother, the true heir to the throne of Puddock, is not dead as she has always thought, and Martha must go on her own quest to find him. The two quests collide, entangling Humphrey, Elaine and Martha's lives, and introducing a host of Arthurian misfits, including a twelve-year-old crone, a magic sword with a mind of her own, a freakishly short giant, and not one but three men in iron masks.