This book has the coolest cover ever. What's great, though, is that the coolness doesn't end there. 
 Charlie and Eli sisters are Gold Rush-era contract killers. They're hired for what Eli hopes to be their last job, as he'd much prefer to hang his holster and settle down with a nice girl--or failing that, the first trollop that crosses his path. It makes no difference to him, really (dude is such a sweetheart). Charlie, on the other hand, is the less sensitive one. It'd be tougher to convince him to make sound retirement plans, what with the allure of all that cash and booze that accompanies "the job." 
 Sounds like the makings of some brilliant Coen brothers film, doesn't it? In fact, this book is brilliant. It is light and humorous without being superficial, it is touching and poignant without being sappy, and with dialogue redolent of Deadwood, I have to wonder if David Milch didn't have a consulting role here. Although maybe that's really the way people spoke in the latter half of the 19th century, in which case, never you mind. 
 But truly, this book deserves any praise it receives. It's a pleasurable read with vividly entertaining characters, and the only thing disappointing about it is that it ends far too quickly. 
 P.S. Don't pretend this book doesn't remind you of Seth Bullock.