Mara's island home is drowning as the ice caps melt and Earth loses its land to the ocean. But one night, in the ruined virtual world of the Weave, Mara meets the mysterious Fox, a fiery-eyed boy who tells her of sky cities that rise from the sea.

Mara sets sail on a daring journey to find a new life for herself and her friends—instead she discovers a love that threatens to tear her apart....