Champion swimmer and Olympic hopeful Dawn Beaumont flees to Moon Island after a car crash leaves her haunted by guilt over the death of a passenger, her career in ruins, and her body damaged. Scientist Grace Ramsay welcomes her cute new neighbor, imagining Dawn could be a pleasant diversion from her secret mission to evaluate Moon Island for corporate purchase by a chemicals giant looking for a waste dump far from civilization. But Dawn won't play ball, in fact she denies she is even a lesbian. Beset by troubling nightmares rooted in the past, and increasing ambivalence over her job, Grace sets out to prove otherwise. Meanwhile Annabel Worth, the owner of the island, is determined not to sell her home to a chemicals conglomerate. But then her plane goes down in the Pacific under suspicious circumstances.