Everything you need to understand or teach Break of Dark by Robert Westall.
Break of Dark is a collection of five short stories recounting eery or supernatural occurrences which involve apparently average, everyday people in circumstances far beyond their normal experience. In fact, this idea is in part the meaning of the title: Mysterious, unknown, and sometimes wholly irrational aspects of the world—what we commonly refer to as the dark side of life—burst into or unexpectedly infiltrate the realm of the familiar...