Perri O'Shaughnessy is the pen name used by the O’Shaughnessy sisters, Mary and Pamela, who collaborate on mystery and thriller novels. Pamela, a graduate of Harvard Law School, previously worked as a trial lawyer, contributing her legal expertise to the sisters’ writing. The O’Shaughnessy sisters are known for their intricate plots and realistic portrayals of the legal system, often focusing on the lives of female lawyers and investigators. Their work frequently explores themes of justice, betrayal, and the dark side of the law.















