Blend of farce and tragedy

JAMES McAvoy's unbridled performance as a scheming, fast-spiralling out-of-control cop is what keeps us interested in Filth, a darkly humorous and deeply disquieting exploration of the descent of a man. That - coupled with copious amounts of over-the-top sex, drug use and violent behaviour that would normally be associated with someone from the dregs of society rather than a trusted officer of the law - makes Filth an intoxicating and yes, dirty blend of farce and tragedy.

McAvoy's character in the film is depraved, divisive and devoid of morals. It's also quite possible that he's completely insane.

Detective Sergeant Bruce Robertson (McAvoy) of the Edinburgh Constabulary is a man perpetually high on cocaine and alcohol and wrestling with inner demons. This nasty boy is in competition with his colleagues on the force for a promotion so when he's put in charge of a murder investigation, he goes all out to destroy their chances while enhancing his own.