The close - knit mother / daughter duo of widow Isabelle and 16 - year - old Amy is challenged by more than just the usual teenage angst when Amy starts fooling around with her math teacher.
The result is one of the most fearsomely original chillers of recent times, its central conceit a subtle, supple metaphor for all kinds of teenageangst, sexual trauma or any of the shadows that latch onto us when we're young, and never quite pass.