Ravenous (Book 1 The Ravening Series)

The world didn't end with a bang, and it didn't go out in a ball of fire. But in some strange way, freezing destroyed the world as we knew it.
When I suddenly find myself surrounded by frozen people who were full of life only moments before, I realize the aliens who came to Earth are nowhere near as benevolent as they claimed. Fleeing the horror they've unleashed, I'm almost captured when Cade intervenes to save me.
Once best friends, it's been years since we had any real interaction, but to survive the hideous monsters hunting us, we'll have to rely on each other again.
As our situation becomes more perilous, I find myself struggling to come to terms with my past, my terrifying new reality, and my growing love for Cade as we fight to evade the aliens that want more than our lives... they also want our blood.