一个外太空执法官被派去偏远的采矿星球执行任务,他发现矿工们逐个死去,并调查出死因是因为服用了来提升采矿能力的麻醉药。正直的执法官决定声张正义,他找到了一些同盟展开行动,这时星球共同体派出的刺客也出发了……Marshal W.T. O'Niel is assigned to a mining colony on Io, one of Jupiter's moons. During his tenure miners are dying - usually violently. When the marshal investigates he discovers the one thing all the deaths have in common is a lethal amphetamine-type drug, which allows the miners to work continuously for days at a time until they become "burned out" and expire. O'Niel follows the trail of the dealers, which leads to the man overseeing the colony. Now O'Niel must watch his back at every turn, as those who seek to protect their income begin targeting him...