Gretchen, an emotionally crushed girl from a cold, barren military family, is dropped off by her parents to stay with complete strangers for several weeks in 1965. On their wheat farm in Kansas, she is befriended by two carefree girls determined to coax her out of her shell. As their friendship develops, they discover a strange island of trees, a hidden cemetery, a stone cave house inhabited by mysterious beings of light, and an ancient ceremonial...