The film "Three Billboards Outside Ebbing, Missouri" begins to develop at a time when Mildred Hayes loses its native daughter. She immediately calls the police, hoping that the servants of the law will be able to find the perpetrator and to plant him behind bars. Officers give her promise to solve the Crime and settle accounts with those responsible for the death of her daughter. But Mildred notices that investigators have absolutely no hurry to learn the materials of the case. Days, weeks, months. A woman regularly drawn to the police, not getting any answers. At some point she realized that investigators did not conduct any cases, preferring all time ennoy over those who are different from them by the color of their skin.
The Charter from happening, Mildred decides to declare War on the city's police. She soon leaves three contradictory messages against the head of the police station on billboards, leading to the town where she lives. He goes berserk and decides to hunt down Mildred.