Seventh-grader Tristan Strong feels anything but strong ever since he failed to save his best friend when they were in a bus accident together. Tristan is dreading the month he’s going to spend on his grandparents’ farm in Alabama, where he’s being sent to heal from the tragedy. But on his first night there, a sticky creature shows up in his bedroom and steals Eddie’s journal. In a last attempt to wrestle the journal out of the creature’s hands, Tristan punches the tree, accidentally ripping open a chasm into the MidPass, a volatile place with a burning sea, haunted bone ships, and iron monsters that are hunting the inhabitants of this world.