Blood of Amber

by Roger Zelazny

Merlin escapes from the crystal cave, and decides to gain leverage over Luke by rescuing his mother from the Keep of the Four Worlds. He spars with the sorcerer who now controls the keep, and who seems to know him. He escapes with the petrified Jasra, and returns to Amber where an unusual Trump summoning imprisons him in the Mad Hatter's tea party.