Where the Crawdads Sing by Delia Owens
I'm sure by now everyone has seen the trailers (or the entire movie) that was created from this book. Main character Kya raised herself in the marshlands of North Carolina after being abandoned by her family. Known in the nearby town as "the Marsh Gil", she is isolated from the community of Barkley Cove, until she finds her life intertwined with first one local boy, and then another. When one of the boys is found dead, Kya is the main suspect. As the story unfolds, it threatens to reveal a great many secrets of Kya and the rest of the town.