There are 3 books in the The Chronicles of Tornor series. The newest book is The Northern Girl which came out in 1980.

1
Watchtower

Book cover of Watchtower
Elizabeth A. Lynn won the World Fantasy Award for Watchtower, volume one in a breathtaking trilogy that would establish her as one of speculative fiction's most exciting voices. Now, Ace brings this classic back to fans and first-time readers alike--in a beautifully repackaged trade paperback edition. Tornor Keep is the…
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This novel of a young servant girl who finds the warrior within herself--and radically alters the peaceful-but-oppressive world in which she lives--is the final volume in Elizabeth Lynn's World Fantasy Award-winning trilogy.

"A marvelous blend of fantasy and realism." --Marion Zimmer Bradley

"Astonishing." --Theodore Sturgeon

"A fine ear for the…