Chapter 1: The Tiny Wall
I was exactly seven years old when the world first bared its teeth at my sister.

Rosie was six, trailing just a year behind me in age, but existing in a universe utterly her own. Her eyes, the color of crushed hazelnut, would ignite with an incandescent joy whenever someone spoke her name with even a fraction of kindness. But the cruel reality of elementary school asphalt is that most children are not kind. They are scavengers, instinctively drawn to whatever appears vulnerable.
My sister possessed an extra chromosome, making her different in a way society seemed eager to punish her for.
They didn’t just tease her; they hunted her. I remember the harsh, staccato rhythm of their laughter echoing across the playground. I remember the way they would point, their small fingers like daggers, until Rosie’s bright smile fractured and the tears finally spilled over her flushed cheeks.
During those moments, I would plant myself directly in front of her. I became a tiny, trembling brick wall, my scuffed sneakers rooted to the dirt, my small fists balled so tightly at my sides that my fingernails cut half-moons into my palms.
“Rosie, you will always have me,” I would whisper fiercely into her hair while the other kids retreated. “You’ll always have me and Ben.”
I repeated that mantra over and over, weaving it into the fabric of her reality until she believed it as absolute truth.
Ben was my best friend. He lived three houses down, a boy with perpetual dirt on his knees and a heart too large for his ribcage. Out of the chaotic swarm of neighborhood children, Ben was the singular boy who never once flinched at Rosie’s differences. When the self-appointed playground captains rolled their eyes during kickball selections, Ben would aggressively pick Rosie first, ignoring the collective groans of his peers.
But it was in the fourth grade that Ben forged a promise I would never forget.
We were sitting on the sun-baked concrete of our driveway. A group of older boys on bicycles had just ridden past, hurling a venomous taunt at Rosie that made her drop her chalk and bury her face in her hands. Ben didn’t yell at the boys. Instead, he calmly dropped his own chalk, crouched down until he was eye-level with my weeping sister, and gently pulled her hands away from her face.
“Rosie,” he said, his voice carrying the solemn gravity of an ancient oath. “When we are older, I am going to take you to the senior prom. That is a promise.”
Rosie gasped, the tears freezing on her cheeks. She clapped her hands together, her entire body vibrating with sheer, unadulterated delight. She turned to me, breathless and beaming.
“You heard him, Cathy!” she squealed. “Ben said it!”
I nodded, my chest blooming with a strange, radiant warmth I was far too young to properly name. I looked at Ben, at the fierce determination in his jaw, and I knew, with absolute certainty, that he was the best person I would ever know.
But as the years stretched and folded into one another, that childhood warmth began to metastasize into something far more complicated, and infinitely more dangerous.