She couldn't hear anything they said with the door closed. Without having the other two Death Eaters in the room with her, she should have felt calmer, but she didn't. A million different possibilities of why they were actually there ran through her mind. Maybe someone had seen her enter his house days earlier. She thought she had been very careful in her stay by not going outside and keeping the curtains closed. Maybe Antonin was confronting the man he had to have known his wife was having an affair with. He could have exhausted all other avenues in his search.