Shadow Man by Alan Drew

Police detective Ben Wade moved back to his hometown of Rancho Santa Elena from Los Angeles four years ago. He and his wife, Rachel, have since divorced, but are co-parenting their teenage daughter, Emma. Life in Rancho Santa Elena has been quieter than L.A., but Ben finds himself tracking down a serial killer and trying to determine if a high school student's death was suicide. The boy who possibly committed suicide was on the school swim team, like Ben was at his age, and the boy's death brings back memories of Ben's childhood and teen years that he would really like to keep buried. Set in the 1980's, Shadow Man, features a changing Southern California along with a character-centered mystery.  It will be published in May.