On a night of frost and ice, Cari falls from the sky, cast out of her world and into ours - and Australia's Cassidy Heights will never be the same. For the secrets she bears are more dangerous than Jake, Keira, and Mikhal could possibly imagine. It's an unusually cold winter, but 15-year-old Jake is more concerned with the ice forming in his dad's new relationship and the fact the girl he likes is dating his best friend. And now his elderly neighbour is acting even weirder than usual. Could life get any more confusing? Then Jake finds Cari, lost and alone. Who is she? What has she got to do with the sudden frost, and the silver city that has appeared in the sky? And what does his elderly neighbour, Mrs. Henders, know about it all? But the secrets Cari bears are more dangerous than Jake can ever imagine. And the fate of our entire world - and that of the City of Silver Light - now rests in their hands.