Raffi works in an observational cosmology lab, searching for dark matter and trying to hide how little they understand their own research. Every chance they get, they escape to see Britt, a queer sculptor who fascinates them for reasons they also can’t—or won’t—understand. Despite years of professors scoffing at the link between the many-words interpretation of quantum mechanics and alternative lives, Raffi can’t help but dream of a universe where they mean as much to Britt as Britt does to them. And just like that, Raffi and Britt are thirteen years old, best friends and maybe something more…  This book is a mind-bending tour across parallel worlds, each an answer to the question of what Raffi’s life would be like if things had happened just a little differently. Across lives Raffi reaches for a life that feels authentically their own. But Raffi’s divergent existences all lead back to the summer of Britt.