Eliot Thorne inherited Marginalia Books from his grandmother, along with her belief that used books hold more than stories - they hold the ghosts of everyone who has read them. At thirty-four, he has made peace with his solitary existence, finding comfort in the smell of old paper and the company of the dead. Then six boxes arrive from what he is told is an estate sale. The books are heavily annotated in the same distinctive handwriting - small, slanted, sometimes cramped in margins, occasionally spilling into blank pages. As Eliot reads, he pieces together a life: strict academic parents who valued books more than people. A career in publishing that ended badly. A marriage that appears in the margins like a developing bruise. A grief that nearly destroyed her. He begins responding in his own books, carrying on an impossible conversation with someone he privately calls M. He tells himself it is a conversation with a ghost. But M is not dead. Margot Vance is forty-one, newly divorced, and trying to reinvent herself in the coastal town where her sister lives. She donated her books to shed an old skin - never imagining they would end up on a shelf labeled 'Books That Changed Me,' with a stranger's handwriting tangled with hers. When Margot walks into Marginalia Books and discovers what Eliot has been doing, she faces an impossible question: Is being known this completely intimacy or violation? Can love built on stolen moments survive the complicated reality of two imperfect people? WRITTEN IN THE MARGINS is a love story for book lovers - about second chances, the courage of vulnerability, and the terrifying magic of letting someone read the parts of yourself you never meant to share.