Winterbourne Hall is not safe. Even as Clare and Dorran scramble to secure the ancient building against ravenous hollow ones, they face something far worse: Clare's sister has made contact, but she's trapped, and her oxygen is running out.

Hundreds of miles separate Clare from Beth. The land between them is infested with monsters, and the roads are a maze of dead ends. Clare has to choose between making a journey she knows she might not survive, or staying safe in Winterbourne and listening as her sister slowly suffocates.

At least, whatever her choice, she’ll have Dorran by her side. And yet there are eyes in the dark. There are whispers in the mist. There is danger lurking in the snow, and one false step could end it all…