A Gathering of Secrets by Linda Castillo

When Daniel Gingerich is found dead in his family's barn and the fire department determines that it was arson, police chief Kate Burkholder wonders who would want the Amish teen dead. Even though he was on Rumspringa and could break some of the rules, he had a girlfriend that he was going to marry. With some investigating, Kate finds out that Daniel had an evil streak and preyed on young women his age. Did someone plan the ultimate revenge on Daniel for all his wrongdoings? A so-so read for me because the mystery feels like a retread of previous books.