"Fans of S. don't just ask each other if they've read the book — they ask each other how they read it. Written by Doug Dorst (with inspiration from concept creator and "novelrunner" J.J. Abrams), the book is a singular experience: Within a worn library copy of fictional author V. M. Straka's nineteenth and final novel, Ship of Theseus, are two readers who've found each other in the margins. There are issues of identity on all fronts — S, the protagonist in Ship of Theseus, has amnesia, and doesn't know who he is; V.M. Straka, his author, is said not to exist and may be a pseudonym for a number of candidates; Eric, a grad student studying Ship of Theseus, is hoping to solve that question of authorship for his dissertation, but he, too, doesn't officially exist, as his university has expunged him. Along comes an undergrad named Jen who picks up Eric's copy of the book, reads his notes, and starts writing notes to him in the margins as she gets pulled into Straka's work and the mysteries surrounding both him and Eric. It's a labyrinth of story-within-story, especially when you consider the footnotes are ciphers."