Trace of Evil by Alice Blanchard

Small towns hold many secrets and memories that you can never really escape. Still searching for the man who tried to kidnap her, murdered her sister and possibly many others, Natalie is now called to investigate the murder of a beloved teacher, her sister's best friend, and married to a detective co-worker. It looks like witch covens, high school love and mean girls have all jumped to the next generation and are hindering Natalie's search for the answers she needs now. Well paced, taut thriller with an air of creepiness from the boogyman and mean girls.