 Knox is tricked into leaving the Fablehaven keys behind with a goblin, but it causes a huge entrance weakness to Wyrmroost when the barrel disappears stranding everyone there.Kendra, Seth, and others venture into a cursed castle called Stormguard on the summer solstice, to fight for the legendary Wizenstone in a tournament started by Humbuggle the dwarf.Cursed by the Key of Forgetting, Seth has lost all memory of his past—his relationships, his experiences, and who he really is.