Jin Song is on top of her game.  Possessed of cybernetically-enhanced reflexes, bankrolled by a growing casino empire, and protected by an army of loyal followers, she seemingly can't lose.

But there's a secret to her success, and a history she'd prefer to leave behind.  What will she do when her past returns to cash out?

The dreaded Zaps are dissolving Trina’s lungs, and only a rare medication can save her. No problem: Xero is an expert smuggler. As the ruler of the Tucson Exiles, she hustles supplies for the government and then pumps the desert full of illegal designer drugs on the sly.

Catastrophe looms when Yuma goes kaboom, and Trina's cure is destroyed along with it. All that remains is a complicated web spun from Xero's biggest demons: money, germs, and drugs. As she struggles to dig up some Ketacillin, one thought stays with her: Who do you have to kill to get some soap and a hot shower? The body count climbs as Xero struggles to protect her friends and stay clean in a very dirty world.