Nowhere is safe. Clare and Dorran scramble to secure their temporary sanctuary from the hungry things outside. The hollow ones, ravenous beings unaffected by the violent winter storms, patiently lie in wait. It's not a matter of if Clare and Dorran are attacked, but when. And Clare knows she'll have to venture out into the night soon…Somewhere far away, Clare's sister Beth is trapped, with only hours to live. Hundreds of miles separate the sisters and the land between them is infested with monstrosities. There's a bitter deadline to this rescue mission, but Clare won't lose Beth without a fight.

She knows she can't survive the trip by herself. But even with Dorran at her side, can she truly hope to face the ruthless predators and make it to her desperate sister before it's too late? They all may be lost to the dark winter.