Mirror in the Shadows. Booger McClain Ozarks Detective Series, #7

When a police detective from Wichita takes a vacation, his idea of fun is trying to catch a serial killer in Springfield, Missouri. Detective Mason Chase can't let an old case go, so he turns to private investigator Booger McClain for help. Together with Booger's resourceful wife, Rose, the trio soon close in on their elusive killer, only to find there's more to this string of cases than anyone realized.
To uncover the truth, the detectives will have to risk everything they hold dear, as well as reflect on what they thought they knew about the past. And what happens when the hunters become the hunted? When dangers lurk in the shadows, the prey can only pray their aim is true.