Jamie Morgan (Jim Sturgess) is a troubled and introverted weirdo with a heart-shaped birthmark on his face who lives in a multicultural hellhole in East London and is thus the object of scorn and ridicule amongst the socially-decaying area’s mostly brown-skinned populous. In terms of employment, Jamie is a photographer who prefers the organic aesthetic of real film over digital diarrhea and who shares a humble studio with his brother George (Timothy Spall) and wigger nephew Lee (Luke Treadaway). One day, a Slavic aspiring model named Tia (French actress/supermodel Clémence Poésy) walks into the studio and Jamie falls in love with her at first sight, but she leaves abruptly and in a rather hysterical manner after idiotic nephew Lee makes a crude sexual remark to her. Meanwhile, as reported on local television, a series of brutal murders involving dismembered body parts committed by mostly nonwhite ‘youths’ wearing demon masks have been occurring around East London. One day, Jamie makes the major mistake of taking photos of the hooded hoodlums—who are not wearing demon masks but are actual demons—and not long after, he is severely beaten and his beloved mother Marion (Ruth Sheen) is set on fire and killed by the hip-hop monsters. On top of that, Jamie’s new friend A.J. (played by intolerable ‘British’ negro actor/director Noel Clarke)—an ex-gang member who has magically turned his life around—is also murdered, with his arm being the only piece of his body that is found by the police. After buying a gun from a shady mongrel to protect himself, Jamie contemplates suicide, but those plans are thwarted when he gets a cellphone call from a mysterious man known simply as ‘Papa B’ (Joseph Mawle of Game of Thrones fame), who invites him to his dilapidated apartment. Upon arriving at Mr. B’s flat, Jamie is greeted by a little Indian girl with a traditional Hindu dot on her head named Belle (Nikita Mistry), who acts as the Mephistopheles-like man’s assistant. As he reveals Jamie, Papa B killed his mother (to make him “ready” to come to him) and is a harbinger of chaos and hell-on-earth who spouts the following speech: “Man is most creative at a time of peace and calm... I don't think so. Give Mankind nothing but calm and order, and Mankind is nothing on its own but a grazing cow. Man needs to be unpredictable to feel truly alive. To progress. To create. Mother Nature knows this. That's why she gives us cyclones, tsunamis. But sometimes, just sometimes, Mother Nature, she can't do it all. So what happens then? I help” and “It’s atrocity that marks the birth of a new era. Gas chambers… Hiroshima… 9/11… And I, in my humble way contribute to that process.”
Ultimately, Jamie makes a seemingly rewarding Faustian pact with Papa B to graffiti city walls with “God is a stupid fuck!” once every few months in return for removing his cock-blocking birthmark. To remove all his birthmarks, Jamie dowses himself with a sort of satanic Molotov cocktail and his entire body is scorched, but he rises from the ashes of his burnt flesh like a proud phoenix. Unfortunately for him, Jamie has been lied to and instead of simply scrawling “God is a stupid fuck!” on already trashed East London buildings, he is told by a funny fellow named ‘Weapons Man’ (Eddie Marsan)—an employee of Papa B—that he must kill a young man in the following manner: “Heart to be cut out while victim is still alive and said heart to be placed on steps of a church, any church, your choice, by midnight.” After refusing to do it and being brutally flung around a wall by an invisible and unknown force at Papa B’s disposal, Jamie gives in and, with the strangely maternal-like help of Belle, goes hunting for a victim. Ultimately, Jamie picks up a young gay narcissistic hustler under the false pretense of buying gay sex and inevitably brutally murders him in his apartment. Meanwhile, Jamie starts a hot and heavy relationship with Tia, but he does not realize she is cahoots with nephew Lee to steal his deceased mother’s jewels to pay back a grotesque-looking gang dealer named ‘She’ (Brit negro mongrel John Macmillan), who controls all the hooded wog monsters in East London. After getting jealous over his friendship with Belle (she calls Jamie “father”), Papa B demands that Jamie kill Tia as punishment. During a struggle, Tia—who actually did end up falling in love with Jamie despite her initially dubious plans—is accidentally shot dead by Lee and Jamie kills She not long after. In the end, Jamie is chased down by hooded demons and later by Papa B, but one of the hood demons, now in human form, ultimately hits him with a Molotov cocktail and he dies in solace recalling a moment with his belated father before ascending to a bright light of sorts. As Jamie is a rather unreliable narrator, it is never clear whether or not the supernatural things he witness are real or merely the product of a damaged and seemingly schizophrenic mind.