" It’s called the Letter Library because a lot of people write more than a note in the margin–they write whole letters and put them between the pages of books. Letters to the poets, to their thief ex-boyfriend or ex-girlfriend who stole their copy of High Fidelity. Mostly people write to strangers who love the same books as them–and some stranger, somewhere, writes back. "

― Cath Crowley , Words in Deep Blue