We Are All the Same in the Dark by Julia Heaberlin
Ten years ago Trumanell Branson disappeared. Her brother, Wyatt, lives as a pariah, cleared of any involvement but tried and sentenced in the court of public opinion. So when he finds a lost girl he believes she is a sign, someone to lead him to his sister and finally clear his name.
Instead she leads him to young police officer Odette Tucker. She knows they must tread carefully – the town, still waiting for its missing girl to come home, is a tinderbox and this new arrival might just set it alight.