Hatchet Island by Paul Doiron

Maine game warden Mike Bowditch accompanies his girlfriend, Stacey Stevens, to Baker Island. Stacey received a message from her friend, Kendra, who is the project manager for the Maine Seabird Initiative on the island. When Mike and Stacey arrive, they find Kendra and her two interns, Garrett and Hillary, weary and concerned. The head of the research on the island, Maeve McLeary, has been missing for two days. In addition, they are being threatened by several locals. It's not long after that violence comes to the island and Mike finds himself trying to unravel who's responsible. Hatchet Island is another solid addition to the Mike Bowditch mystery series, featuring a great sense of place on the islands of Maine.