In 1989 the trimaran Rose Noelle set sail from Picton, New Zealand, bound for Tonga with four crew. After a freak wave capsized the yacht, they drifted for 119 days before landing on Great Barrier Island.

In 1999, South African emigrant psychiatrist Colin Bouwer murdered his wife in what he thought was an undetectable manner. He was not counting on the skills and tenacity of New Zealand police and his colleagues in the medical prof...