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In a 19th century Britain, the wealthy Xavier-Marko couple pay Erik, a hired killer, to put their disabled son Charles "out of his misery". Instead, Erik saves Charles from dealing with those kind of parents ever again. Charles follows Erik back to London and eventually convinces the assassin to take him under his wing and teach him the trade. When their lives cross paths with a destructive opium cartel led by the shadowy Sebastian Shaw, they decide to take down the businessman down no matter the cost.