Nick Kolakowski 
Rattlesnake Rodeo [EPUB ebook] 

Three nights ago, bounty hunter Jake Halligan and his ultra-lethal sister Frankie were kidnapped by a sadistic billionaire with a vendetta against their family. That billionaire offered them a terrible deal: spend the next 24 hours in the backwoods of Idaho, hunted by rich men with the latest in weaponry. If Jake and Frankie survived, they’d go free; otherwise, nobody would ever find their bodies.

Jake and Frankie managed to escape that terrible game, but their problems are just beginning. They’re broke, on the run, and hunted by every cop between Oregon and Montana. If they’re going to make it through, they may need to strike a devil’s bargain-and carry out a seemingly impossible crime.