Saltcrop by Yume Kitasei

In Earth's not too distant future, seas consume coastal cities, highways disintegrate underwater, and mutant fish lurk in pirate-controlled depths.
When Skipper and sister, Carmen, receive a cryptic plea for help, they must put aside their differences and set out on a voyage through a dying world both beautiful and strange, encountering other travellers along the way. An epic journey spanning oceans and continents and a wistful rumination on sisterhood, friendship, and ecological disaster.

Available in Brighton Library, Kindle, Kobo, the paperback will be published at the end of August.