Murder Under The Sun - Niki Dupre Mysteries, #5

Tammy Campo breaks out in blisters while basking in the sun on her dock, and her husband David is suspected of murdering her. Convinced of his innocence, David's aunt hires Niki Dupre to find out what or who killed Tammy. Niki follows a trail of similar deaths to the maker of a suntan lotion in Natchitoches, the oldest settlement in the Louisiana Purchase. At the production plant, things are not what they seem.
After being ambushed on her first night there, Niki's investigation only gets worse. Every time they get close to solving the riddle, more pieces are added to the puzzle. Can they figure out who killed Tammy?