Gunsmith Cats: Shades of Gray #1

Rally Vincent is a gunsmith by trade -- but she earns her living hunting bounties. Usually she gets paid in cash, though sometimes information pays better interest. That's the case when she catches up with her latest target, an engaging con man named Logan. Logan's got the lowdown on Gray, the vicious killer who wants to catch Rally by the tail, and he intends to parlay that prize for all it's worth in Shades of Gray.