An Acceptable Time (Time Quintet #5)
Author: Madeleine L'Engle
Desc: A flash of lightning a quiver in the ground and instead of her grandparents' farm Polly sees mist and jagged mountains—and coming toward her a group of young men carrying spears. Why has a time gate opened and dropped Polly into a world that existed three thousand years ago? Will she find her way back to the present before the time gate closes—and leaves her to face a group of people who believe in human sacrifice?