Imagia is not the same place it was when Sam Little first passed through his gateway as a small boy. Now he's grown and the problems of the world weigh heavily on his shoulders. Friends and Guardians look to him and his power for answers he doesn't have while he desperately tries to find a way to keep a promise he never wanted to have to make. Shadows of the North are spreading as Nadaroth tightens his grip. Now, when they least expect it, the balance of the world is shaken once more with a most unexpected event. With it has come a whole new set of problems no one ever thought was possible.
Sam's powers have grown, but the grief and pains of the past have hardened him. His Guardian, Yetews, sees the change and worries Sam will never be the same again. All the while, Sam wonders:
Is he becoming the thing he fears most?
Everyone must band together and find a way to set things right before the entire world is covered in shadow. Imagia is in the worst danger it's ever known and if Sam and his friends can't find a way to set it right, the gateways will close forever. Sam must once more make choices that will not only change his life forever, but the fate of the world.