Could you do what it takes to keep humanity safe? Even if it means condemning yourself to Hell for all eternity? 

In 1630, Elizabeth Burford watches as an innocent girl is put to death. A death Elizabeth helped make happen. 

In 1950, Elizabeth Burford runs for her life, pursued by a man she once called her brother. A man who died over a year ago. 

Elizabeth is part of the Circle, a group that believes they must find and sacrifice innocent souls for a ritual that keeps the Devil bound in Hell. They live set apart from the world, knowing that no one outside their number could ever understand the necessity of what they do. No matter how horrific their actions, the alternative means the death of everything. 

But when one of their number turns against them, Elizabeth must confront the possibility that everything the Circle believes is a lie. And if that is the case, how can she possibly face the terrible things she has done in the name of something she no longer believes in?