Avenger is the latest international thriller by Frederick Forsyth, who needs no introduction: his past bestsellers in this vein include The Day of the Jackal and The Odessa File. The avenger is Calvin Dexter, outwardly a small-town US lawyer, who was shaped into a formidable killing machine by Vietnam. There are horrific flashbacks to his war career as a "Tunnel Rat", fighting the Vietcong at close quarters in their own deadly underground labyrinths. After taking the law into his own hands for a bitter personal revenge on a Central American mobster, Dexter hires out his expertise to grab untouchable criminals from safe havens and deliver them into the clutches of US justice.