"S." is a novel written by J.J. Abrams and Doug Dorst, published in 2013. The book is presented as a fictional manuscript titled "Ship of Theseus" by an author named V.M. Straka. It includes handwritten notes in the margins, which are conversations between two readers, Eric and Jennifer, who are trying to uncover the identity of the mysterious author and the meaning behind the story. The novel is unique in its format, combining text, images, and various inserts like postcards and letters. This interactive approach invites readers to engage with the narrative on multiple levels, making it a complex and immersive reading experience. The layers of storytelling explore themes of identity, authorship, and the nature of literature itself.