History and the speculative collide with the modern world when a group of high school girls form a secret society after discovering they can communicate with boys from the past, in this powerful look at female desire, jealousy, and the shifting lines between friendship and rivalry. After her life is upended by divorce and a cross-country move, 16-year-old Saskia Brown feels like an outsider at her new school—not only is she a transplant, she’s biracial in a population of mostly white students. One day while visiting her only friend at her part-time library job, Saskia encounters a vial of liquid mercury, then touches an old daguerreotype—the precursor of the modern-day photograph—and makes a startling discovery. She is somehow able to visit the man in the portrait: Robert Cornelius, a brilliant young inventor from the nineteenth century. The hitch: she can see him only in her dreams. Saskia shares her revelation with some classmates, hoping...