Colorado Springs, late 1970s. Ron Stallworth, an African American police officer, and Flip Zimmerman, his Jewish colleague, run an undercover operation to infiltrate the Ku Klux Klan.

Tony Lip, a bouncer in 1962, is hired to drive pianist Don Shirley on a tour through the Deep South in the days when African Americans, forced to find alternate accommodations and services due to segregation laws below the Mason-Dixon Line, relied on a guide called The Negro Motorist Green Book.