For better or for worse, Sarah Anderson has it a thriving career, a nice home in Ottawa, two young kids…and a marriage coming apart at the seams.

Then her husband, Matthew, vanishes without a trace during a family vacation up north. Sarah and her children are nearly lost among the slumbering lakes, treacherous cliffs, and brooding forests of the Canadian Shield. A glacier-scraped realm of ancient beauty and terror, it’s a world away from the safety of the suburbs. And a big storm is brewing.

A kind rural lawman comes to their aid and takes an interest in the case. The trail goes cold, however, launching Sarah into a yearlong odyssey to find her husband. On the way, she must reconnect with her estranged sister and duck the suspicions of a slick city police officer. But that’s nothing compared to unearthing the dark secrets buried deep in the granite of her marriage—and in herself.