“At sixteen, Alaric and Naia were as alike as any two people of opposite sexes can be. They had the same dark eyes and hair, same long straight nose, wide mouth—even the same slightly crooked front tooth. But it wasn’t looks alone. Far from it. They shared a history, a lineage, memories, and had lived all their lives in the same house, Withern Rise, where they had occupied the same room, done the same things, more often than not had the same thoughts at the very same instant. And yet… They had never met. They hadn’t the faintest inkling of each other’s existence. They knelt at their windows, on their beds—same window, same bed, unknown and invisible to each other—gazing out at the same water, trees, February sky.” But even though they lived identical lives as the same person, Alaric and Naia’s circumstances could not have been more different. Alaric lost his mother to a train accident two years ago while Naia’s mother (the same mother) was alive and well. Alaric’s house was cold and dirty, as it had not been kept up after his mother’s death. Naia’s house (the same house) was snug and warm and clean and had even recently been redecorated. Two realities so much the same but so different, running parrallel to each other but never touching. Until Alaric finds the crack. He didn’t know what he was doing, and he didn’t know what was happening to him. And then suddenly he finds himself in his very own home but this home is warm. This home has different furniture and it’s clean. This home has his mother, alive and safe. But this home also has Naia, his identical self. Alaric and Naia criss-cross into each other’s realities experiencing each other’s lives until time runs out and the crack closes, and Alaric and Naia are once again stuck in a single reality never to cross paths again. But which reality?