Sister Light, Sister Dark

Mythopoeic Fantasy Award for Adult Literature: Best Novel nominee (1991).
Nebula Award: Best Novel nominee (1990).

Sister Light, Sister Dark was originally published for adults.

Book One of the Great Alta Saga

"Lovers of fantasy will appreciate this title," raved Library Journal, and Publishers Weekly called it a "fine novel." It is the story of Jenna. Raised on a mountainside, she learned the arts of the warrior, and from the mountain women the magic of the ancient lore. But the greatest magic of all was her ability to call forth her dark sister from the depths of the mirror of the land of light and shadow.

Skada was the dark one, able to exist only when the moonlight cast a shadow or lamplight flickered in a darkened room.

This is the story of Jenna and Skada. Sister Light and Sister Dark.