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　　Three things are certain about base jumping. You will break your bones. You will watch your friends die. And – if you do it long enough – it will eventually kill you. In this heady, testosterone-packed environment, adrenaline junkie Karina Hollekim is regarded as one of the best of the best. We follow Karina for several years as she hurls herself off increasingly treacherous cliffs in search of the ultimate high. But when tragedy strikes, will the rush have proved worth the price?