What happens when a black detective goes undercover in the KKK? An extraordinary true story. In 1978, Ron Stallworth is the first black detective in the history of the Colorado Springs Police Department. In the local paper, he finds a classified ad for the Ku Klux Klan - and a P.O. box for interested enquiries. All he's expecting are some racist brochures and a few scraps of information about the white nationalist terrorists in his community. What he gets is a phone call inviting him to join the KKK.