Shortly before midnight one frosty October evening, something strange started to happen near Edinburgh Castle. It began with a slight breeze; just a whisper on the wind, a gentle soughing among the leaves of Princes Street Gardens. Then it changed, becoming a rustling in the bushes, a flattening of the sparse grass. Despite the chill, a sort of shimmer, like a heat haze, appeared in the dark, still air above Princes Street.
Waiting in the shop doorway, homeless Kate nodded in approval.