Katie and Matt are champion ocean swimmers, who love nothing better than a challenge that will test their training and skills to the limit. But even the toughest Sydney beach is nothing compared with the course of events mapped out for them by their parents!

Effi and Christie live in another world - intense, funny, often overheated and far removed from the coast in so many ways. And when those two worlds meet, in an unforgettable blend of love and loss, violence and poetry, only the strongest will succeed in swimming against the tide.