Soul Catcher (2007) by MIchael White

This is an historic novel set in the US in the 1850's. It is about a slave catcher who is dispatched to catch and return a couple of runaway slaves.  The book is mostly from the slave catcher's point of view.  He is a complex character.  He is not good, nor is he bad, and somewhere in the middle I ended up rooting for him.  It is a story of redemption and good nearly but not quite triumphing in an evil system.