Alison has just married Australian Sean Weston. Both of their children struggle with the new family situation, and Alison's former husband wants her back. When Sean disappears during a morning surf, it is not clear if he got caught up in a rip tide or if there is more to his disappearance.

During their annual vacation at an isolated beach, Ben and Vee unexpectedly encounter a mysterious backpacker who draws them into a twisted web of lies, deceit and ultimately, revenge.