Harvard journalism student Matt (Elijah Wood) is expelled from the university because his roommate is hiding drugs in his wardrobe. The helpless Matt is unable to contact his father as far away as Kabul, so he has to pack up and go to his sister in London. Brother-in-law Steve is very unfriendly and gives Matt to his brother Pete (Charlie Hunnam). Pitt is the leader of West Ham United fan organization GSE, he soon let the Yankee Matt see the blood of British fans, Matt's cowardice disappeared with his fist at rival fans, and Pitt gradually integrated him into an environment full of beer and violence. GSE member Bowa, who is extreme and always hostile to Matt, expelled Matt at all costs when he found out that Matt and his father were associated with the journalist status that the fan organization hated most. At this time, Matt was surprised to find that his brother-in-law was the former leader of GSE, and outside the pub, a violent clash among fans was brewing.