Bat's Children by Sylvia A. Winters

Arwel and his family are bad stock, everyone knows it and they're happy to say it—but left with a towering debt and no means to pay it, survival means living on the wrong side of the law. Arwel has little doubt his life will end via the hangman's noose, but the risk of execution is better than the alternative.

Tomi makes a living buying and selling pretty things, including those that Arwel passes along from his roadway victims. Tomi has few morals when it comes to business, and if buying stolen goods brings him closer to Arwel, so much the better.

Then one night a robbery goes wrong, and Arwel finds himself on the brink of losing everything he holds dear, including his life, and Tomi doesn't know if he'll ever see him again.