Knight of Shadows

Knight of Shadows is the fourth book in the second Chronicles of Amber series by Roger Zelazny and the ninth over all book in the series published in November 1989.

Plot
Jasra is left in charge of the Keep of the Four Worlds, where she had ruled before - as Julia's teacher, before Julia decided to outwit her and take over. She turns out to be exactly the right person to leave in charge there, as she does not wish for the power of the Fount of the Four Worlds herself, but is quite happy to prevent others using it, since gaining its power destroyed the last of Brand's humanity, and she appears to have genuinely loved him, and lost him to his power-lust. Merlin tries to use Trump magic to locate Coral - with the help of Mandor, Jasra and even his own creation Ghostwheel, with whom he is back on good terms - but is ambushed by various ghostly constructs of people that have walked the Pattern and the Logrus, and even by Corwin's most recent Pattern-ghost (from his own Pattern, not the pattern of Amber), and finds himself drawn into a struggle between the Logrus, the fundamental power of chaos, and the Pattern, the fundamental power of order. It is revealed that the Pattern, and its chaotic counterpart the Logrus, are sentient, and wish Merlin to choose a side to tip the balance of the multiverse towards one or the other - with other Pattern-ghosts and Logrus-ghosts also taking part in the "trial" to influence him one way or the other. He attempts to refuse the "test" but is confronted by the Powers That Be themselves, the Unicorn of Order and Serpent of Chaos. They try to make him choose between them using ghosts of family members who have traversed their two paths. He attempts to walk the route of neutrality to avoid choosing sides, but ends up being tricked into taking sides twice - firstly by having a Chaos dagger planted on him as he sleeps before attempting to take the middle path in a three-way choice between the extremes of Order and Chaos (this is rather appropriate: he would rather aid neither side, but his chosen method is usually the magic of Chaos), and secondly he is coerced into aiding the Pattern to strengthen its position in Shadows, while rescuing Coral from her imprisonment. During the trial he somehow obtains possession of the Jewel of Judgement: the attempt to return it to Castle Amber provokes a confrontation between the Pattern and Logrus themselves, causing a mighty explosion in which Mandor suffers a broken arm and Coral loses an eye. The ty'iga demon in Nayda's body escapes and tries to return the Jewel to the Logrus, but is captured by Ghostwheel - which, after removing both Nayda and the Jewel, passes its own synthetic "consciousness" through the Jewel, thus traversing the Pattern. Coral's damaged eye is operated on by Dworkin, who replaces it with the Jewel of Judgement. Merlin investigates Brand's old quarters, and finds his old sword Werewindle, and a mysterious and powerful "spikard" ring, which he keeps. Random sends him to the kingdom of Kashfa as the Amberite representative at a coronation... that of none other than Luke, who is crowned as "King Rinaldo I", having overthrown Random's candidate Duke Arkans, in a largely bloodless coup. Since he has a fairly legitimate claim on the throne himself, is on better terms with his neighbors (Begma, who objected to Duke Arkans), and has given up his vendetta on Amber, Random is letting things stand. Further complications ensue when it turns out that Coral - now Merlin's lover - is actually Luke's long-forgotten wife following a diplomatic arranged marriage in childhood (although Luke seems willing enough to have it annulled in the future). Merlin goes to present Luke with Werewindle as a memento of his father, but they are ambushed by Jurt (again). Jurt is defeated but steals Werewindle as he flees.