Black Ice by Becca Fitzpatrick

Britt Pfeiffer has never been that adventurous, but that’s about to change. Wanting to impress her ex-boyfriend, Britt convinces best friend, Korbie, to take a trekking trip with her. But when a freak storm leaves the girls stranded they seek shelter in a cabin, where they find two knights in shining armour. Or so they think.