C.J. Box 
Stone Cold [EPUB ebook] 

Everything about the man is a mystery… No one knows where he came from, how he made his money or what’s drawn him to the isolated Black Hills of North Wyoming. His generosity has won the locals over, but are his motives above suspicion? After a string of disappearances, Joe Pickett isn’t the first investigator to pursue this enigmatic millionaire, but will he be the first to leave alive? With winter’s first storm closing in, Joe’s about to discover there’s a stone-cold killer stalking the hills and he’s not alone.