MacDonald is the author of Caught in the Act: The Feldberg Investigation (1994), which gave her account of gaining access to the laboratory of Professor Wilhelm Feldberg at the National Institute for Medical Research laboratories in Mill Hill, London. The investigation revealed that insufficient anaesthesia was being used on animals, which led the Home Office to revoke the researchers' licence.
- MacDonald, Melody. Caught in the act: the Feldberg investigation, Jon Carpenter, 1994. ISBN 1-897766-05-X