Margaret McLean was born and raised in Rome, New York. She graduated magna cum laude from Boston College and earned her law degree from Boston College Law School. McLean practiced law as a criminal prosecutor and is now a legal analyst on numerous national television and radio shows. She has cowritten a dramatic courtroom play based on her second novel, Under Oath, and she also has a nationally syndicated weekly radio show called It's a Crime Radio.
In 2010, she was hailed as one of the next faces of Boston crime fiction by The Boston Globe. She lives in Norwell, Massachusetts, with her three children.