1997’s young adult fantasy Crown Duel is the first novel in Sherwood Smith’s Crown Duel series. It was followed by 1998’s Court Duel. Both are included in this omnibus. Together, they are part of the larger Sartorias-deles sequence.
Two young aristocrats, Meliara and her brother Bran, learn that King Galdran is planning to break the Covenant with the Hill Folk; he wants to clear-cut the valuable colour trees of Tlanth, Meliara and Bran’s domain. The two feel that they must protect the trees, and the Covenant, and the only way to do so seems to be mounting a rebellion against their liege lord. Conveniently, the siblings have been plotting an uprising for some time; Galdran is an all-round bad king and he is comprehensively hated.
Their rebellion is not going well. Potential allies have refused to help; their mercenary army has already betrayed them.