Dear Fox, Hey. It’s Sahra. I’m tagging you from center M691, Black Hawk, South Dakota. It’s night and the lights are on in the center. It’s run by an old white guy with a hanging lip—he’s talking to my mom at the counter. Mom’s okay. We’ve barely mentioned you since we left the old group in the valley, just a few weeks after you disappeared. She said your name once, when I found one of your old slates covered with equations. “Well,” she said. “That was Fox.”

illustrated by Melanie Ujimori