Charlotte Armstrong (1905-1969) was an Edgar Award-winning American author of mystery short stories and novels. Born and raised in the mining region of Michigan’s Upper Peninsula, she moved to New York and received a B.A. degree from Barnard in 1925. She had two plays produced on Broadway but neither was successful, so she turned to writing mystery fiction, beginning with Lay On, MacDuff (1942), the first of three detective novels featuring Professor MacDougal Duff. Several of her novels were adapted for film, including The Unsuspected, The Chocolate Cobweb, and Mischief.