Perri O’Shaughnessy is the pen name for two sisters, Mary and Pamela O’Shaughnessy. Together they have written twelve Nina Reilly legal thrillers, a stand-alone thriller, Keeper of the Keys, and one short story collection, Sinister Shorts. Pamela, a graduate of Harvard Law School, practiced law in Monterey, San Pablo, and South Lake Tahoe, California, for sixteen years. She lives in northern California. Mary worked as a multimedia editor for many years. She lives with her husband and children near San Francisco.