With help from his friends, Fort tries to find and bring the last dragon to the Old Ones in exchange for releasing Fort's father, while they continue to seek the books of magic.

Fort becomes entangled with legendary creatures and foes in this thrilling fourth novel in the fantastical series from the author of the New York Times bestselling Story Thieves! The future has been saved, but at a cost: Fort Fitzgerald has been expelled from the Oppenheimer School, and some of Fort's friends have been lost in time. But time is the one thing Fort, Rachel, and Jia don't have, as they'll soon be facing one of the eternal Old Ones,...