The Wicked Day

Mary Stewart
HarperCollins
9780060548285
0-06-054828-2

Born of an incestuous relationship between King Arthur and his half sister, the evil sorceress Morgause, the bastard Mordred is reared in secrecy. Called to Camelot by events he cannot deny, Mordred becomes.

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Arthur's most trusted counselor -- a fateful act that leads to the "wicked day of destiny" when father and son must face each other in battle.