I went to Steve Hockensmith's signing at Murder by the Book last night and picked up a copy of the hardcover, though I did a blurb for the book and had already read an ARC. So you can tell I liked it.
Though this book is set in Montana around 1892, St. Martin's is wisely marketing it as a mystery novel, which it is, and not as a western, which it also is. Old Red and Big Red Amlingmeyer are a couple of cowboys who admire the exploits of Sherlock Holmes (who's a real person as we all know). Old Red decided to emulate the Holmesian method in solving the murder of the general manager of their ranch, and the fun begins.
If you've read Steve's stories in EQMM about the Amlingmeyer brothers, you know you're in for a good time with this well-plotted mystery. And plenty of laughs as well. Check it out.