Steganography is hidden writing. You hide a message in a crossword puzzle, a novel, a work of art, in the dapple of a dawn river. Even your hidden message can hide other messages deeper, as here. Eat one of the berries Red has made, and you would find a simple message, and inside that message, the poison. And inside the poison, farther down, legible only as in death, she hides another letter. A true letter.