Four misfits find themselves struggling with ordinary problems when they are suddenly pulled through a mysterious portal into the Overworld: a bizarre, cubic wonderland that thrives on imagination. To get back home, they'll have to master this world while embarking on a magical quest with an unexpected, expert crafter, Steve.

After a tragic event happens, composer John Russell moves to Seattle to try to overcome it and build a new and peaceful life in a lonely big house that has been uninhabited for many years. But, soon after, the obscure history of such an old mansion and his own past begin to haunt him.