Twelve-year-old Sebastian keeps finding photographs that are eerily similar to one another, despite the fact that they span vast differences in place and time. The common element in them all? A mysterious book. Sebastian’s search for answers, which his logical mind craves, leads him to Carver Middle School and two students who have formed an unlikely friendship over their desire to save the school library. Henrietta and TP couldn’t be more different, and yet they share having a difficult home life, Henrietta because of the premature death of her mother and TP because of a harsh, authoritarian father. But what brings them together is the safe haven of the school library, which the head librarian wants to “modernize” to include research resources but nothing to feed the imagination. Henrietta loves nothing more than losing herself in a good fantasy novel, and TP finds the library a quiet, secluded place to draw. Neither of them wants to see it remodeled to remove the books and art to be replaced with computers. But when a new assistant librarian is hired, she gives Henrietta a book that reveals glimpses of what Henrietta’s future could be, setting the friends on a mission to fulfill the possibilities that are in the book—and also within themselves. Their new pursuit leads Sebastian to them, and the three children discover that the book is more extraordinary than they could have thought possible. Both the book and the librarian hold incredible stories, which Sebastian must allow himself to believe and which Henrietta and TP must allow themselves to carry out. This story is told in a double narrative, offering readers multiple perspectives on the topics of logic, reason, imagination, and the potential of possibility when people give themselves permission to believe—in the seemingly impossible and in themselves.