"There are two Earths. Perfectly ordinary and existing in parallel. There are no doorways between them, no way to cross from one world to another. Unless you're a shifter. Canna and Lily are the same person but they refuse to admit it. Their split psyche has forced them to shift randomly between worlds - between lives and between families - for far longer than they should. But one mind can't bear this much life. It'll break under the weight of it...