Cop Town by Karin Slaughter (2014)
Set in 1974 Atlanta, Cop Town follows rookie police officer Kate Murphy and her partner Maggie Lawson. In this gritty suspense, the women investigate The Shooter—a marksman picking off police officers—despite not being detectives because of their gender. Karin Slaughter's standalone novel is not for the faint of heart, featuring derogatory language and violence (along with racism, sexism, and homophobia). With flawed yet sympathetic main characters and a compelling story, you'll keep reading to solve the case alongside Kate and Maggie.
The novel won the 2015 Ian Fleming Steel Award from the British Crime Writers' Association.