“But it’s my face. Mine and Greta’s. We don’t belong to everybody.”

“I stared at Greta’s back. At her matted hair, decorated with brown torn leaves and dirt. What was happening to my sister? What if I’d never come? How long would she have stayed hidden in those cool, damp leaves? How long before she woke up alone and scared, with nothing but the howling of wolves to keep her company?”

“As the elevator door started to close, she stood and put up one hand to wave goodbye. That’s one of those frozen memories for me, because there was something in Greta’s solemn wave that made me understand it was about something bigger. That as the elevator door eclipsed the look between us, we were really saying goodbye to the girls we used to be. Girls who knew how to play invisible mermaids, who could run through dark aisles, pretending to save the world.”

“I . . . Why do you want me to?” There was a flicker of something in Greta’s look. I couldn’t tell whether it was a flicker of love or regret or meanness, and then she said, “Why wouldn’t I want you to?” Because you hate me, I thought, but I didn’t say it.”

“It was a nice thing for her to say. In her way. With Greta you have to look out for the nice things buried in the rest of her mean stuff. Greta’s talk is like a geode. Ugly as anything on the outside and for the most part the same on the inside, but every once in a while there’s something that shines through.”

“Don’t you see? It’s like we’ve known each other all these years. Without even seeing each other. It’s like there’s been this . . . this ghost relationship between us. You laying out my plectrums on the floor, me buying black-and-white cookies every time I knew you would be coming over. You didn’t know that was me, but it was.”

“I came to a sketch where the space between my arm and Greta’s arm, the shape of the place between us, had been darkened in. The negative space. That’s what Finn called it. He was always trying to get me to understand negative space. And I did. I could understand what he was saying, but it didn’t come naturally to me. I had to be reminded to look for it. To see the stuff that’s there but not there. In this sketch, Finn had colored in the negative space, and I saw that it made a shape that looked like a dog’s head. Or, no—of course, it was a wolf’s head, tilted up, mouth open and howling. It wasn’t obvious or anything. Negative space was kind of like constellations. The kind of thing that had to be brought to your attention. But the way Finn did it was so skillful. It was all in the way Greta’s sleeve draped and the way my shoulder angled in. So perfect. It was almost painful to look at that negative space, because it was so smart. So exactly the kind of thing Finn would think of. I touched my finger to the rough pencil lines, and I wished I could let Finn know that I saw what he’d done. That I knew he’d put that secret animal right between Greta and me.”