"I'm only twenty-three," Sonia says, her hands dropping, though her muddled brain is starting to churn through this. She gives Miles's face another good, close look, seeing the lines in his face that are there -- so much she doesn't yet recognize, but she can't dismiss this idea like she could Byerly's. She finally looks away from Miles, toward her sister and Piotr dancing across the room.

"They don't know, do they?"