While reluctantly agreeing to help gather the rathstones to open Hallowmere, Sibohan is thrown back to twelfth-century Scotland, to the beginning of the conflict with the Unhallowed.
Christina wakes up in a new world with no memory of who she is; and the key to her past is somehow wrapped up in her mission to save the duke and duchess who have taken her in.
After her parents' deaths during the Civil War, sixteen-year-old Corrine is sent to reform school in Culpeper, Virginia, where she discovers a sinister plot involving a race of faeries and the disappearance of some of the students.
In 1866, after her boarding school is destroyed, Corrine and two of her classmates travel to Scotland to retrieve the stolen rathstone from the Unhallowed, but when tensions arise among the girls, Corrine is uncertain in whom to put her trust.
