Straight As an Arrow — Celestine Sibley

IT WAS A PLACE WHERE NOTHING BAD EVER HAPPENED. UNTIL NOW.
It had been a while since Atlanta reporter Kate Mukay paid a visit to the house she and her late husband had built on a tiny, isolated island off the coast of Florida. But when a good friend from the island calls to report an attempt on her own husband's life, Kate packs up a few provisions and heads for the ferry.

Who would want to murder anyone on quiet little lla Island, where a locked door is as rare as a rust-free car? Perhaps the same person who leaves Kate a frightening calling card. With a list of suspects as small as the island population, Kate sets out to uncover the killer before her name is added to the growing list of victims.