Gone Missing by Linda Castillo

Painters Mill police chief Kate Burkholder is asked to consult with the Ohio Bureau of Criminal Investigation (BCI) on a series of disappearances of Amish teenage girls. The girls had all been rebelling against their strict Amish upbringing during Rumspringa by smoking, drinking, and becoming involved with the opposite sex. Kate grew up Amish, and when a relative of her sister's family goes missing, the case takes a personal turn. Kate knew Sadie (who reminds Kate of herself at that age) and is fearful about her possible fate. With Kate's lover John Tomasetti of BCI working with her, she hopes she'll be able to bring the girls home alive and apprehend the culprit.