Waking at midnight from a strange dream, Steven Glass at first thinks everything is normal. True, the world outside isn't behaving itself, and he seems to have acquired a talking cat as a companion, but apart from that, what's changed? A great deal, as it happens. For Steven is a Sleepwalker, one who can enter the dreams of others, and he must cross over to the Dreamland with one purpose in mind: to find the Dream Thief and thwart his nefarious plan. And if Steven fails, it will not only mean the destruction of the Dreamland, but of our own world with it...