The events of The Glass Sentence transformed the world, as well as the life of fourteen year old Sophia Tims. Since then she’s continued searching for clues to her parents’ disapperance, combing Boston’s archives and libraries. Across the country, her friend Theo is searching, too. When Sophia learns that her mother’s diary and the story of her parents’ fate is in a distant archive, she makes a split second decision and sets off with an almost complete stranger on a sea voyage to a place where she knows no one. Weeks later, Theo returns to Boston and immediately sets off on a new voyage of his own. This book is written in alternating voices, studded with extracts from Minna Tims’s diary, and filled with all manner of wonders, including startlingly new kinds of maps.