As a member of the most powerful family history has ever known, thirteen-year-old Dan Cahill has been shot at, kidnapped, and even thrown into a pit with a deadly snake. He's survived it all due to luck, smarts, and his older sister, Amy, who always sticks by his side. Now Dan and Amy are facing their greatest threat yet, an enemy who has found a way to use the source of the Cahill family power against them. To stop him, Dan and Amy must set out on a desperate mission that will take them from one of the world's hottest regions all the way to the frozen blast of the Arctic Circle. But with the enemy closing in , Dan finds himself facing the one terror he never imagined - being betrayed by his own sister.

十三歲的丹是凱西歐家族歷來最厲害的成員。即使被狙擊、被綁將、被丟入有奪命毒蛇的坑洞中，靠著運氣、機智和同他並肩作戰的姐姐，丹成功保住性命。但是自從敵人知道如何利用凱西歐家族的超能力對付他們時 ，丹和艾咪便面臨無比的危險。為了制止敵人，丹和艾咪必須分頭出擊；從地上最炎熱地方到北極酷寒地區，他們須奔走各地來進行任務。正當敵方逐步逼近，始料未及的事驚撼了丹──他竟然被自己的親姐姐所背叛！