"Night and Day" by Virginia Woolf is a novel published in 1919. Set in Edwardian London, it follows two women—Katharine Hilbery and Mary Datchet—as they navigate love, marriage, and personal freedom. Katharine, from a literary family, secretly prefers mathematics while wrestling with romantic entanglements involving William Rodney and Ralph Denham. Mary works for women's suffrage but struggles with unrequited love. The novel asks whether marriage is necessary for happiness and whether love and duty can coexist in a changing world. (This is an automatically generated summary.)