Blood of the Warden — M.A. Nichols

Buried under the guilt of the past, Annie fights to save the future. 

Two years ago, Annie faced an agonizing choice--save her family or unleash an evil into the world. Weighed down by the dark memories of her past, Annie is a shadow of the person she once was. With fervent determination, she desperately seeks to save countless souls from suffering the repercussions of her choices. But at what cost? 

The Dark Knights are on the hunt, slaughtering whole families in their quest to open the Drogue, but when they go after Emma Shaw, Annie sees a chance to atone for her past and save her friend.