Three teenage brothers—gang-member Bobby, troubled mama's boy Alan and self-assured prankster Lex—reside in a downtrodden section of 1968 Glasgow. But as Bobby and Alan begin to experience the power of raging hormones, Lex begins a downward spiral after he accidentally shoots the leader of Bobby's gang, and his youthful cockiness and immaturity unfortunately prevent him from understanding the effect his subsequent crimes will have on not only himself, but also those around him.