Mateo, who was Byron’s half-brother, gave Emily the impression that this was a warm and loving family. As she made her way through the entrance hall and into the living room, she got a good vibe about the house. Well-worn gloves and hats hung in the hall, ready for farm work, while the living room was decorated with stone carvings and books on gleaming wooden shelves.

“Mateo, did you get the door?” a woman’s voice called from one of the back rooms. “Who is ...