Lois Duncan (b. 1934) is an author of more than fifty books for young adults. Her stories of mystery and suspense have won dozens of awards and many have been named Best Books for Young Adults by the American Library Association. Among the many honors and accolades she has received for her work, in 2015, Lois Duncan was named a Grand Master by the Mystery Writers of America. Duncan was born Lois Duncan Steinmetz in Philadelphia, Pennsylvania; she grew up in Sarasota, Florida. By age ten she was submitting her work to magazines, and she had her first story published nationally when she was just thirteen. In 1994, Duncan released a nonfiction title, Who Killed My Daughter?, after her youngest child was killed in a crime that was never solved.