McHargue was born in New York City. After working at Golden Press, she became an editor at Doubleday. She had a long career working as an author, she published 35 books including many children's fiction books and nonfiction works on archaeology, history, mythology and paranormal. She also wrote on folklore and occult topics.
McHargue moved to Groton, Massachusetts. She edited reports in archaeology and history for Michael's Institute for Conservation Archaeology at Harvard's Peabody Museum and for their historic preservation company Timelines Inc. Her book Facts, Frauds, and Phantasms: A Survey of the Spiritualist Movement (1972) was a skeptical study of spiritualism. The book exposed fraudulent mediums and was described in a review as a "well researched and intriguing case study in human gullibility."
- The Horseman's Word (1988)
- See You Later, Crocodile (1988)
- The Turquoise Toad Mystery (1983)
- The Talking Table Mystery (1982)
- Stoneflight (1982)
- Funny Bananas: The Mystery in the Museum (1976)
- Private Zoo (1975)
- The Beasts of Never (1988)
- A Field Guide to Conservation Archaeology in North America (1977)
- Mummies (1972)
- Facts, frauds, and Phantasms: A Survey of the Spiritualist Movement (1972)
- The Impossible People: A History Natural and Unnatural of Beings Terrible and Wonderful (1972)
- Adele Sarkissan. (1987). Something about the Author Autobiography Series. Volume 4. Gale. p. 12
- Gloria Negri . (2011). Georgess McHargue. Boston Globe.
- Obituary for Georgess McHargue
- Book Review. Facts, Frauds, and Phantasms; A Survey of the Spiritualist Movement. Kirkus Reviews.