Hair Trigger

"Rip and Wilma are Detroit -- soulless, cold, desperate, and mean, but not without a certain charm."
 
“Hair Trigger is a fast-paced, tightly plotted noir set in the mean streets of today’s Detroit. It features a likeable “hero” who just happens to be a stone-cold killer with a winning sense of humor. He could well be a successor to Donald E. Westlake’s wonderfully amoral super crook Parker.” 
 
PEACE, LOVE, and UNDERSTANDING don’t appear in the lexicon of professional killers Rip Hunter and his partner Wilma. They have their own set of rules. It’s what’s made them successful for the past fifteen years and, more importantly, what’s kept them alive. 

•  Never use the same gun twice 
• Always get half the money upfront 
• Never use real names 
• Always be neat and discreet 

But times are tough in Detroit, especially in the murder-for-hire business. When Rip breaks one of their cardinal rules out of pure greed, it sets off a cascade of calamity and they find themselves on the run from killers more ruthless than they are.