Mr. X (Daniel Craig) is a drug dealer with a rich record. However, when he was about to retire early, the dealer did not let him go so easily. His big client Jimmy (Kenneth Cranham) brought him two deals: find the missing daughter of his competitor Eddie (Michael Gambon), and help the Duke to sell the huge amount of ecstasy in his hand. This task seems to be a piece of cake, but in the process of tracking Eddie's daughter, Mr. X learned from Eddie that there was something strange about this matter. Jimmy turned out to be an undercover police officer, and this operation was to put Mr. X in jail. When Mr. X was embarking on the second task, he accidentally discovered that the Duke had a grudge with the ruthless Serbs because of this batch of ecstasy. As the situation develops, Mr. X finds that he has unknowingly entered a dangerous situation. The peaceful old age in his mind seems to have become more and more distant and difficult. Just like his name, the biggest unknown is whether he can escape from the crisis unscathed... This film is adapted from JJ Connery's novel of the same name.