"You're telling me the Victoria and Albert Museum only exists because seven guys needed to hide a handful of objects for a hundred years?" Finding herself unable to draw anything but vines, 19-year-old Rebecca reluctantly puts her ambitions as an illustrator on hold when she is drawn into the machinations of a Victorian secret society founded to make safe an interface between parallel worlds. But first Rebecca has to grow up. Dragged into helping a cause in which she still barely believes, Rebecca finds herself playing Hunt-the-Thimble amongst England's oldest institutions. Over the course of her twentieth summer she will break a code, discover her astonishing ancestry, and half fall in love - twice. But what begins as a game will shake her to the core.