The document summarizes a story about an undercover MI5 agent who is seeking revenge on the mafia that killed his brother. He goes undercover and falls in love with the head of the mafia's wife. When he is discovered, the mafia boss, played by Sylvester Stallone, tries to kill him. The agent, played by Jason Statham, is forced to take on another mission from the mafia - to kill his boss from MI5.