 Policeman Marshal William T. O  Niel has been transferred to the mining outpost located on Io, one of Jupiter s moons. And O  Neil is about to have the worst time of his life at the mining outpost, when he is assigned to investigate the violent deaths of miners, only to discover the miners have died of drug overdoses from a lethal drug. As O  Niel sets out to find the drug dealers, he finds himself the target of hired assassins, whom have been hired to assassinate O  Niel. With no help from the Police Force, O  Niel sets out to stand against the drug dealers, as he begins to suspect the outpost s corrupt administrator Sheppard may be involved with the drug dealers.