Bret found the letters today. I'd forgotten to lock the door to my study, and Nancy got in. I hadn't locked the desk because I'm usually so careful about locking the door, so Nancy — large for her age, and with the determined energy of all toddlers — scaled my writing chair and dug a group of letters out of one of the cubbyholes. She was eating pieces of correspondence by the time Bret found her. "Thank God you use blue felt-tip and not red," he told me later, "or I'd have thought she was dying."

I'd gotten home to find a freshly scrubbed Nancy nursing a bottle of apple juice, and Bret on the floor of the study, gingerly sorting pieces of blue-smeared paper. "Hi," he said when he saw me. "She was eating these. I haven't been reading them, really I haven't, I'm just trying to put them back together —"

"It's okay," I said. My drive home through autumn foliage had soothed me, and thirty feet from my study window shone the Delaware River, bright waterfalls chattering on rocks. We're too high here for the river to be tranquil, but it's usually merry. It reminds me of Nancy. "I trust you."

Bret scratched his nose, getting ink on it, and said, "I know you don't want anybody in here."

"It's okay," I said. "I forgot to lock the door." I'd remembered that I'd forgotten to lock the door as soon as I was irrevocably ensconced in the supermarket checkout line, and all the way home, as the car swept aside falling leaves, I'd been wondering what would happen. I'd never forgotten to lock the door before. "It's probably because I trust you."

Bret looked at the pieces of paper surrounding him. Nancy actually hadn't eaten much, maybe a year's worth out of fifteen. I picked up one of the torn sheets, which recorded a fragment of my first vacation with Bret. A good year: the kid couldn't be faulted for her taste. "Do you trust me enough to tell me what they are?" Bret asked.

"Letters," I said, and looked away from him, out at the river. Water has always calmed me.

"Unmailed?"

"They're to my sister."

"Really," Bret said, not happily. In my peripheral vision, I saw him scratch his nose again. "What about?"

"Myself. You, Nancy. Like a journal, really."

"Oh," he said. "You write her letters even though you never knew her? Or because you never knew her? Emma?"

You didn't lock the door, I told myself firmly, finally failing to be comforted by the river, and said, "I knew her. I did."

"How? When?"

"She visited me," I said carefully, looking back at Bret, "when I was twelve. When we were both twelve."

Bret shook his head and said just as carefully, "How'd she get there? I mean, she couldn't exactly have walked. Could she?"

If you told Myrna you can tell Bret, I told myself. He's your husband. He knows you're not crazy. You love him. You didn't lock the door. "Actually," I said, "the first time I saw her she was doing cartwheels."

Bret started to smile, and evidently thought better of it. Nancy, finished with her juice, discarded the bottle and let out a joyous shriek; Bret reached out and retrieved the bottle, beating it against his thigh in a tattoo that told me how tense he was, despite his seeming calm. "Cartwheels. Okay. Where?"

I closed my eyes, remembering the predawn grayness of that April Wisconsin morning, the ranks of shadows cast on the walls by the venetian blinds, row upon row of thin horizontal bars, and how I'd risen out of my body to try to get away from them, away from the bars and the grayness and the noise. My mother said that dawn was the noisiest time of day because of the birds, but birdsong wasn't the sound I dreaded. Breathing was.

"Emma?" Bret asked gently. "Where was she doing cartwheels?"

I swallowed. Talking hadn't been this difficult for years. "On my bedroom ceiling."

* * *

I recognized her right away. I probably would have recognized her even if her picture hadn't been hanging all over the house, because she'd inherited our parents' best features, the ones I'd always wanted: Mom's blue eyes and flowing auburn hair, my father's roman nose and firm chin. I'd gotten the leftovers: Mom's gap teeth and propensity to freckle at the slightest hint of sunlight, my father's frizzy brown curls and big ears. My tendency to fat must have been a recessive trait from several generations back, because neither of my parents was about to claim it.

"Ginny was light as a bird," my mother often said with a sigh. She kept Ginny's favorite nightgown — a frilly affair with lots of lace and ribbons — carefully preserved in a cedar chest, and often told me that Ginny was prettier in that nightgown than most little girls were in party dresses. I always wore pajamas. My mother hated pajamas.

To my surprise, Ginny was wearing a pair of yellow cotton pajamas with Snoopy on them, which must have made doing cartwheels a lot easier. I'd been hovering next to the ceiling, counting the lilac blossoms on the tree outside my window, when she came tumbling through the wall my bedroom shared with hers. Her red-gold curls were mussed from her calisthenics, but the cartwheels were perfect. She didn't seem to know I was there, but she looked solid enough; to my satisfaction, she didn't even have a halo.

I'd only learned how to leave my body a few weeks before, after years of feigned sleep, and I was still surprised at how easy it was: one of those skills that seems impossible at first but quickly becomes second nature, like tying your shoes. Because I wasn't in my body, I could define directions any way I wanted to. I rotated so that my feet were on the ceiling and the breathing was coming from over my head. As always, I tried not to pay attention to it, but today it was louder than usual and counting flowers hadn't been helping, so Ginny was a welcome distraction. She reached the opposite wall and I wondered if she'd go through it, into my parents' room — Mom would really love that — but instead she turned and started doing cartwheels in the other direction, coming back towards me.

"Hi," I said. "What are you doing here?"

She stopped and stood up — which meant that her feet were planted on the ceiling like mine — and squinted at me, frowning, her head cocked to one side. "Cartwheels," she said. The breathing sounded like a hurricane now, but if Ginny heard it she didn't let on. Mom never heard anything either; that must have been another congenital tendency. I may have been fat, but at least I wasn't deaf.

"You can't do cartwheels," I told her. I'd never been able to do cartwheels, no matter what I was wearing. "You aren't even supposed to be here. You're dead. Go back to your own room, where you belong."

"But I am supposed to be here," she said. "I wouldn't be here if I weren't supposed to be here."

"That's called circular logic," I told her, "but I grade easier than Mom does so I'll let you pass this time, if you tell me why you're here."

She was there to distract me from the breathing; it was easy enough to figure that out. Maybe she'd be able to teach me how to go through walls too, and then I'd finally be able to get into her room. The door had been locked for as long as I could remember. Mom didn't want anybody in there and my father acted like the room didn't exist at all, and if the key was still around somewhere I sure hadn't been able to find it. I'd have bet all my Nancy Drew books that Ginny's room was nicer than mine.

"I don't know why I'm here," Ginny...