After being wrongfully expelled from Harvard University, American Matt Buckner flees to his sister's home in England. Once there, he is befriended by her charming and dangerous brother-in-law, Pete Dunham, and introduced to the underworld of British football hooliganism. Matt learns to stand his ground through a friendship that develops against the backdrop of this secret and often violent world. 'Green Street Hooligans' is a story of loyalty, trust and the sometimes brutal consequences of living close to the edge.

An old firm leader returns to Green Street for revenge after receiving a call that his little brother was killed, but is he able to cope with a new type of hooliganism and can he find his killer?

Following the deadly climax of "Green Street Hooligans," several members of the West Ham firm and numerous members of Millwall end up in jail. The GSE quickly discover the brutality of life on the inside, as they are constant targets of the superior numbers and better-financed Millwall crew.