"When Christian pushes into the brick wall of the building catty-corner to the rear of BB&B—first left on the Dark Zone side—and disappears, I melt down in a fit of the giggles. I toss a rock at the spot where he vanished. It bounces off the brick and clatters to the cobblestone. I'm feeling twenty shades of Harry Potter's train station, especially when he pokes his head out of the wall and says impatiently, "Come on, lass. This is hardly my favorite place to be."