Sophie Thatcher has startling green eyes that penetrate as though accessing some forbidden truth. You can observe them onscreen, bearing witness to untold terrors — roasted bodies, botched resurrections — in bloody thrillers. They roll slightly now as she explains the promotional rigamarole she’s been forced into during her stay in New York, less intense but still mesmerizing. We meet for coffee in the Financial District, right before the 24-year-old actress is scheduled...