Mail order bride is my favorite trope in historical's set in America (just like arranged marriage is in the European ones). This was was just perfect. 
 Kind and understanding but troubled loner for a hero? Check! 
 Intelligent heroine? Check! 
 A great over all story? Check! 
 Slow burn? Check! 
 Love scenes that manage to be both steamy and yet very emotional and authentic? Check! 
 Some mystery and danger? Check! 
 This is one of my favorite romance novels I've read all year.