The Ghost of You

AU. S3 spoilers. "Sherlock Holmes," she replied softly, not quite meeting his gaze. "I thought you were dead." Sherlock shook his head. "Obviously not," he replied. [...] "What are you doing here?" he asked again, beginning to get impatient. "Hiding," she replied. "Do you want me to leave?" Sherlock thought about it for a moment, before shaking his head. "No."