Jonathan Marker has stopped on the road as dusk closes in, unable to take his eyes off the silhouette of a massive castle looming against a bank of heavy clouds ahead. The towers seem to lean over him as they cut into the sky. A wave of nausea washes over his exhausted body, forcing him to look away — but the pull of the castle brings his gaze back. Slowly, reluctantly, he begins walking toward the great gate at the end of the track.