In 1963 the Bristol Omnibus Company is operating a colour bar and refusing to hire any black or Asian drivers or conductors. Black people organise a boycott of the buses and many white people try to help them. Bristol University students organise marches and speeches in support, but the campaign soon becomes bitter, with people of colour facing aggression and insults.
Dabber, a young white conductor, gives what support he can. His girlfriend, Melody, joins Bristol women as they continue the long struggle to achieve equality. But bus crews have their own problems to deal with as the stresses of the job take their toll. Will the bus company ever bring on the blacks?