After Adam Walker's father throws him on the grim streets of Yttrium, Walker must find a way of sustaining himself. Thus, he turns to the Population Improvement Program to complete "bounties" for the U.R government. However, after a bounty goes wrong, Walker must grapple with the biological aftermath, all the while trying to reverse the changes.

Chet, a college mechanical engineer-whose idiocy rivals his genius-constructs devices powered by Stardust: a mineral mined from meteorites that amplify the different fundamental energies of the universe.

And Sonya Vinogradova, an experienced bounty hunter indoctrinated by a religious church older than the city of Yttrium itself, has found a way out…except, whether she has the heart to follow through is a different story altogether.

Follow the three of them as they battle mutated creatures, other bounty hunters, shadowy figures, love, and even themselves.