Murder and Madness — Susan P. Baker

When P.I. Mavis Davis takes on the grisly ax murder of a cruise ship captain in Galveston, Texas, she wades right into the middle of an open investigation, navigating the island from one end to the other, searching for answers to five-year-old questions. Faced with a terminally ill client, Mavis must find the perpetrator fast or her client will go to her grave heartbroken that her brother's killing remains a mystery.