Jeffery Lemire 
The 13th Street Haberdashery [EPUB ebook] 

The seemingly accidental discovery of a 1968 Mustang in a swamp reopened a fifty-year-old case that had never been solved involving the disappearance of three high school girls. It tore the scab off some old wounds that most people thought were healed and pretty much forgotten. Sheriff Mack Becker thought that he knew just the man to figure out what happened those many years ago. He contacted recently retired FBI agent Mark Bellingham, who specialized in cold cases and had amassed an impressive record of closures.

Nobody had a clue as to what was about to unfold in the small Mid-American town of Pleasant Valley. The outcome of the investigation would shock the entire town and send ripples across the country.