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**Repairman Jack must stop a new drug that unleashes otherworldly rage in this supernatural thriller by the *New York Times* –bestselling author of *The Tomb*.** Can you imagine a new chemical compound that heightens your assertiveness, opening the door to your primal self and giving you a physical and mental edge wherever you compete? The non-addictive designer drug Berserk promises just that. It gives you a God-like feeling of supremacy . . . and releases uncontrollable rage that could turn you into a killer . . . Jack finds himself fighting the criminal forces behind Berserk. After combing New York City’s criminal underworld, Jack realizes that the drug comes from a most surprising source . . . a source that may have deadly effects on Jack’s life and the lives of those he cares most about . . . **“One of the all-time great characters in one of the all-time great series.” —Lee Child**

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