" Your sister is indeed correct,” Dr. Pym said. “Each of the Books of Beginning has a unique name. Technically, the book we are searching for is the Atlas of Time—” “That’s right,” Emma said, nodding seriously. “Technically.” “—but it is usually just referred to as the Atlas, an appropriate name, as the book contains maps of all possible pasts, presents, and futures and allows one to move through both time and space. But now is not the moment to get into all the whys and wherefores.” “Sure,” Emma said, “we can get into those later. All the whys and stuff.” In "

― John Stephens , The Emerald Atlas (The Books of Beginning, #1)