Frostbite (Vampire Academy, Book 2) by Richelle Mead

It’s winter break at St. Vladimir’s, but Rose is feeling anything but festive. A massive Strigoi attack has put the school on high alert, and now the Academy’s crawling with Guardians—including Rose’s hard-hitting mother, Janine Hathaway. And if handto- hand combat with her mom wasn’t bad enough, Rose’s tutor Dimitri has his eye on someone else, her friend Mason’s got a huge crush on her, and Rose keeps getting stuck in Lissa’s head while she’s making out with her boyfriend, Christian! The Strigoi are closing in, and the Academy’s not taking any risks.... This year, St. Vlad’s annual holiday ski trip is mandatory.

But the glittering winter landscape and the posh Idaho resort only create the illusion of safety. When three friends run away in an offensive move against the deadly Strigoi, Rose must join forces with Christian to rescue them. But heroism rarely comes without a price…