Everything you need to understand or teach The Boxes by William Sleator.
The Boxes is one of Sleator's best novels.
Taking the ancient Greek myth of Pandora and her box and turning it on its head, The Boxes has many plot twists, menacing events, tense scenes, and amazing settings, and it sparkles with intelligence. In it, Annie is asked by her beloved but mysterious Uncle Marco to guard two boxes, one made of wood, the other metal. Uncle Marco forbids Annie to open either one...