With her fifteenth birthday imminent, Tess is running out of time. She must decide who, or what, she will become when she makes the final Switch of her life. To make the impossible decision even...

Kevin knows that Tess is a Switcher, for he is one too - able to take on any animal shape he chooses and to think, feel and live as that creature. Kevin persuades Tess to join him as a rat, and...