Unknown Jane is a pseudonym used by an anonymous author who wrote a novel in the early 19th century. The novel, which was published in 1818, is believed to have been written by a woman, although her true identity remains unknown. The crossword solution for the term 'Unknown Jane' is DOE, which is a three-letter acronym for 'Daughter of Eve'. This phrase is often used to refer to women in general, and is a reference to the biblical story of Adam and Eve.