After reading Catching Fire, I was amused to see that the criminals in Les Miserables pass messages in and out of prison, and across prison yards, encoded (or sometimes simply hidden) in bread. Eponine checks out the Rue Plumet house while everyone else is in jail, and reports back with a biscuit, indicating that it’s not worth the effort.
TODO: Look up when I read Catching Fire and add a note on it to Just a Lark