From Wikipedia, the free encyclopedia. Dennis Lehane (born August 4, 1965) is an American author. He has written several award-winning novels, including A Drink Before the War and the New York Times bestseller Mystic River, which was later made into an Academy Award-winning film. Another novel, Gone, Baby, Gone, was also adapted into an Academy Award-nominated film. His novel Shutter Island was adapted into a film by Martin Scorsese in 2010. Lehane is a graduate of Florida International Univers ...