a book series by Rachel Cohn and David Levithan, the holiday rom-com show — which is now streaming — follows New York teens Dash (Austin Abrams, “Euphoria”) and Lily (Midori Francis, “Gotham”) as they get to know each other via a written correspondence in a notebook.Lily initially leaves it on the shelf of iconic bookstore the Strand, in hopes of sparking a romance with a like-minded book nerd.