When a local black politician is murdered an undercover police officer unveils a web of police corruption which puts lives at risk and threatens the whole community.

A white boy lives in a racially divided town. The only thing he cares about is playing his drums. A popular black band from school needs a drummer and he joins them, but being colour blind in this town makes life very difficult.

The daily lives of the men and women at Sun Hill Police Station as they fight crime on the streets of London. From bomb threats to armed robbery and drug raids to the routine demands of policing this ground-breaking series focuses as much on crime as it does on the personal lives of its characters.