Glen never has anything nice to say to anyone, so when he gets lost in the woods during a school field trip and encounters a strange creature, there is bound to be trouble.

Months after her sister's death, Marianne wakes up to find a growth of thick black hairs along her spine. They defy her attempts to remove them, instead proliferating, growing longer. The hairs, Marianne's doctor tells her, are a reaction to trauma, developed in the wake of the loss of her sister, Marie. Her doctor recommends that Marianne visits Nede, a modern, New Age rehabilitation center in a remote forest in Wales where the patients attend unorthodox...