Mary Virginia Carey (1925-1994) was an American author best known for her contributions to the popular children's book series "The Three Investigators." Born in New Brighton, Pennsylvania, Carey authored over 100 books in her lifetime, including many titles in the "Three Investigators" series after the death of the original series creator, Robert Arthur, Jr. She was also a prolific writer of mystery novels, often featuring young adult protagonists. In addition to her work on "The Three Investigators," Carey wrote under various pseudonyms and contributed to other series, including "Nurse Matilda" and "Bret King." Her writing was characterized by engaging plots, enjoyable mysteries, and relatable characters, making her a favorite among young readers.