Lancelot-Grail: The Old French Arthurian Lancelot, Part 3/Lancelot, Part 4, Book 04, (Paperback)

Parts three and four of Lancelot begin with the episode of the false Guinevere, in which Guinevere is accused of being an impostor; Lancelot is then abducted and imprisoned by Morgan le Fay, who out of hatred for Arthur intends to reveal their love to the king. When he escapes, Guinevere is abducted by Meleagant, and Lancelot has to rescue her. In the course of these adventures, the Grail appears for the first time: Lancelot comes to the Burning Tomb, where he learns that his sins will prevent him from succeeding in the Grail Quest; and Gawain reaches the Grail Castle, but fails the test.