A young interracial couple has just moved into their California dream home when they become the target of their next-door neighbor, who disapproves of their relationship. A tightly wound LAPD officer has appointed himself the watchdog of the neighborhood. His nightly foot patrols and overly watchful eyes bring comfort to some, but he becomes increasingly aggressive to the newlyweds. These persistent intrusions into their lives cause the couple to fight back.

Outside a movie premiere, enthusiastic fan Peppy Miller literally bumps into the swashbuckling hero of the silent film, George Valentin. The star reacts graciously and Peppy plants a kiss on his cheek as they are surrounded by photographers. The headlines demand: "Who's That Girl?" and Peppy is inspired to audition for a dancing bit-part at the studio. However as Peppy slowly rises through the industry, the introduction of talking-pictures turns Valentin's world upside-down.