A story of Ron Stallworth, a detective in Colorado Springs, Colorado, who in 1978 answered an ad in the local newspaper seeking new Klan members. He not only gained membership, but rose through the ranks to become the head of the local chapter.

Stallworth, who is black, was able to gather all sorts of intelligence by pretending to be a white supremacist on the phone or via other forms of correspondence but sent a white fellow officer in his place for any in-person meetings. During his undercover work, Stallworth managed to sabotage several cross-burnings and other activities of the notorious hate group.