In this final book in Kate Thompson's riveting trilogy, Tess has reached her pivotal 15th birthday. She must now decide who, or what, she will become when she makes the final Switch of her life. As Tess agonizes over which shape to take as her permanent one, she finds herself in an eerie patch of woods far from home and, most importantly, Kevin. What on earth will she do in the ild woods? And what will the wild woods do to her?