Have You Seen Her

The shifting viewpoints added depth and suspense, but I wonder if this was planned from the start or developed during writing. How does this approach influence the tension?

The story felt like it was building up to something big, but the middle sections seemed a bit slow. Was that intentional to deepen character development or a pacing choice?

Some chapters delved deeply into characters' pasts, which enriched the story but also slowed the momentum. What guided the decision to include so much backstory?