Abandoned by husband James, Agatha hops on a plane to the South Pacific, hoping to mend her broken heart But there she meets a happy honeymooning couple, for whom disaster strikes when, tragically, the bride drowns Back home, alarm bells start ringing for Agatha when a woman, dressed in a wedding gown, is swept down river The police say suicide, but Agatha, spurred on by recent memories, particularly her own disastrous marriage, sets out to prove them wrong