After Killing a Rival in Self-defense, Hoodlum Chas (James Fox) Must Flee Both From The Law and From His Boss, Harry Flowers.  He eventually moves into a house owned by Turner (Mick Jagger), a former rock star who lives with female companions Pherber (Anita Pallenberg) and Lucy (Michele Breton). 

Chas and Turner initially clash, but Turner becomes fascinated with Chas' life as a criminal. 

Through drugs and a series of psychological battles with Turner, Chas emerges a different man.

"Performance" is a bizarre, disconnected attempt to link the inhabitants of two kinds of London underworlds: pop stars and gangsters. It isn't altogether successful, largely because it tries too hard and doesn't pace itself to let its effects sink in.

But it does have a kind of frantic energy, and it introduced Mick Jagger in a role that reinforced his stage image without copying it. 

On its most fundamental plot level, it's about a gangster (James Fox) who is trying to disguise himself so that he can slip out of England on a forged passport. 

He meets the Jagger character by accident when he takes a basement room in a boarding house.

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