Hooked on Diamonds

Jed Namara had a corner office, award-winning ad campaigns, and a therapist who charged $300 an hour to look sadly at her notepad. He gave it all up for a battered straw hat, a leaking boat, and a tumbledown tuna cannery on a speck of Polynesian island with no roads, no electricity, no internet, and - as his one dead fish after a six-hour fishing trip suggested - no future. But Goodway Island holds a secret.
Somewhere in its caves, hidden since 1944, is a tin of Namara's Gold Brand Tuna. And inside the tin? Diamonds. The problem is finding them before the government health inspector shuts him down, before the cannery's ancient pressure cooker achieves independent flight, and before he does something spectacularly inadvisable - like falling in love with Kami Rangi. Kami is indispensable, infuriating, and not remotely interested in being anyone's consolation prize.
She also happens to know exactly which cave his grandfather visited eighty years ago. In a place the modern world forgot to reach, two people with every reason not to trust each other are about to discover that some treasures are considerably harder to walk away from than diamonds. Hooked on Diamonds - where the Wi-Fi is nonexistent, the fish aren't biting, and the one thing you came for turns out not to be what you needed at all.