What is the fine-grained topic of the following text: Robert Mitchum stars here as a world-weary petrol station attendant with a dodgy past which comes back to haunt him in the form of a ruthless racketeer he double-crossed years before - and now, both men's fates are bound up with an ice-cool femme fatale. Only return the topic.
Robert Mitchum's role as a petrol station attendant with a past in a film.