Chapter 1

When I was four and Cass was six, she whacked me across the face with a plastic shovel at our neighborhood park. We were in the sandbox, and it was winter: In the pictures, we're in matching coats and hats and mittens.

My mother loved to dress us alike, like twins, since we were only two years apart. We did look alike, with the same round face and dark eyes and the same brown hair. But we weren't the same, even then. The story goes like this: Cass had the shovel and I wanted it.

My mother was sitting watching us on a bench with Boo, who had her camera and was snapping pictures. This was at Commons Park, the small grassy area in the center of our neighborhood, Lakeview. Besides the sandboxes it also had a swing set, one of those circular things you push real fast and then jump ona kind of manual merry-?go-?roundand enough grass to play baseball or kickball.

Cass and I spent most of the afternoons of our childhood at Commons Park, but the shovel incident is what we both always remembered. Not that we ourselves recalled it that well. We had just heard the story recounted so many times over the years that it was easy to take the details and fold them into our own sparse memories, embellishing here or there to fill in the blanks. It is said that I reached for the shovel and Cass wouldn't give it to me, so I grabbed her hand and tried to yank it away.

A struggle ensued, which must have looked harmless until Cass somehow scraped one hard plastic edge across my temple and it began to bleed. This moment, the moment, we have documented in one of Boo's photos. There is one picture of Cass and me playing happily, another of the struggle over the shovel (I'm wailing, my mouth a perfect O, while Cass looks stubborn and determined, always a fighter), and finally, a shot of her arm extended, the shovel against my face, and a blur in the left corner, which I know is my mother, jumping to her feet and running to the sandbox to pull us apart. Apparently, there was a lot of blood.

My mother ran through the winding sidewalks of Lakeview with me in her arms, shrieking, then took me to the hospital where I received five tiny stitches. Cass got to stay at Boo and Stewart's, eat ice cream, and watch TV until we got home.

The shovel was destroyed. My mother, already a nervous case, wouldn't let us leave the house or play with anything not plush or stuffed for about six months.

And I grew up with a scar over my eye, small enough that hardly anyone ever noticed it, except for me. And Cass.

As we grew older, I'd sometimes look up to find her peering very closely at my face, finding the scar with her eyes before reaching up with one hand to trace it with her finger. She always said it made her feel horrible to look at it, even though we both knew it wasn't really her fault. It was just one more thing we had in common, like our faces, our gestures, and our initials.

When Cass was born my mother still wasn't sure what to name her. My mother had suffered terrible morning sickness, and Boo, who had moved in next door during the fourth month or so, spent a lot of time making herbal tea and rubbing my mother's feet, trying to make her force down the occasional saltine cracker. Boo was the one who suggested Cassandra.

“In Greek mythology she was a seer, a prophet,” she told my mother, whose tendencies leaned more toward Alice or Mary. "Of course she came to a horrible end, but in Greek mythology, who doesn't?

Besides, what more could you want for your daughter than to be able to see her own future?" So Cassandra it was. By the time I came along, my mom and Boo were best friends. Boo's real name was Katherine, but she hated it, so I was named Caitlin, the Irish version. Cass's name was always cooler, but to be named for Boo was something special, so I never complained. Her name was just one thing I envied about Cass. Even with all our similarities, it was the things we didn't have in common that I was always most aware of.

My sister wasn't a seer or a prophet, at least not at eighteen. What she was, was student body president two years running, star right wing of the girls' soccer team (State Champs her junior and senior year), and Homecoming Queen. She volunteered chopping vegetables at the homeless shelter for soup night every Thursday, had been skydiving twice, and was famous in our high school for staging a sit-?in to protest the firing of a popular English teacher for assigning “questionable reading material”Toni Morrison's Beloved. She made the local news for that one, speaking clearly and angrily to a local reporter, her eyes blazing, with half the school framed in the shot cheering behind her.

My father, in his recliner, just sat there and grinned. There were only two times I can remember ever seeing Cass really depressed.

One was after the soccer State Championship sophomore year, when she missed the goal that could have won it all. She locked herself in her room for a full day. She never talked about it again, instead just focusing on the next season, when she rectified the loss by scoring the only two goals of the championship game. The second time was at the end of her junior year, when her first real boyfriend, Jason Packer, dumped her so he could “see other people” and “enjoy his freedom” in his last summer before college.

Cass cried for a week straight, sitting on her bed in her bathrobe and staring out the window, refusing to go anywhere. She drew back from everyone a bit, spending a lot of time next door with Boo where they drank tea, discussed Zen Buddhism, and read dream books together. This was when Cass became so spiritual, scanning the world around her for signs and symbols, sure that there had to be a message for her somewhere. She got into three out of the four schools she applied to, and ended up choosing Yale.

My parents were ecstatic and threw a party to celebrate. We all applauded and cheered as she bent over to slice a big cake that read watch out yale: here comes cass! which my mother had ordered special from a bakery in town. But Cass wasn't herself. She smiled and accepted all the pats on the back, rolling her eyes now and then at my parents' pride and excitement.

But it seemed to me that she was just going through the motions. I wondered if she was looking for a sign, something she couldn't find with us or even at Yale. She stayed in this funk all the way through graduation. In mid-?June she went to stay with her friend Mindy's family at the beach and got a job renting out beach chairs by the boardwalk every day.

Three mornings into it she met Adam. He was down at the beach on vacation with some friends from the show, and rented a chair from her. He stayed all day, then asked her out. I could tell when she called the next morning, her voice so happy and laughing over the line, that our Cass was back. But not, we soon learned, for long.

I don't think any of us knew how much we'd needed Cass until she was gone. All we had was her room, her stories, and the quiet that settled in as we tried in vain to spread ourselves out and fill the space she'd left behind.