After thirteen-year-old Tucker Feye's parents disappear, he suspects that the strange disks of shimmering air that he keeps seeing are somehow involved, and when he steps inside of one he is whisked on a time-twisting journey trailed by a shadowy sect of priests and haunted by ghostlike figures.

In seventeenth-century Scotland, sixteen-year-old Maggie Blair is sentenced to be hanged as a witch but escapes to the home of her uncle, placing him and his family in great danger as she risks her life to save them all from the King's men.

In the prison-like school that is his last chance, thirteen-year-old Robbie tries to recover from events that brought him there, including his uncle's war injuries and the death of a classmate who may have been his friend.