Just when it seems the summer excitement is over, a freak accident sends Dipper, Mabel, Stan and Ford hurtling into a parallel universe; worse still, it's being menaced by yet another demented monster - one that seems very interested in Dipper. Now it's time to see if the team can tackle the problems of another world... and live long enough to find a way home.

There is a monster lurking under the Capital Wasteland, a beast of nightmares, a dragon of the Old World. This is the story of that monster, of his days in the sunlight, of his reign of terror beneath the earth, of his encounter with the Lone Wanderer, and what happened after. Brace yourself for the worst, for this is the story of Dr Stanislaus Braun.