This is one of Steve Hockensmith’s “Holmes on the Range” spin-off series about the AA Western Detective Agency’s other agents.
In this novel, Diehl, Hoop, and Eskaminzim, plus Hoop’s wife (and Eskaminzim’s sister) Onawa, are off chasing bank robbers–or are they? Turns out the robbers have stolen something far more precious than the contents of a tiny town’s bank vault, and they’re after nothing less than the downfall of the Union.
This was just published, and I’m about halfway through, but it’s just as good as Hockensmith’s other novels. I like the characters and, as always, just when you think you’ve got the plot figured out, the author tosses in yet another plot twist. If you like action, mystery, and historical novels, you should pick up a copy of this book (and probably the first one in this series, Hired Guns).