Matthew Langdon Cost also publishes under Matt Cost Matt Cost was a history major at Trinity College. He owned a mystery bookstore, a video store, and a gym, before serving a ten-year sentence as a junior high school teacher. In 2014 he was released and began writing. And that’s what he does. He writes histories and mysteries. Cost has published five books in the Mainely Mystery series, with the sixth, "Mainely Mayhem", due out in November of 2024. He has also published five books in the Clay Wolfe Trap series, the most recent being "Pirate Trap". For historical novels, Cost has published "At Every Hazard" and its sequel, "Love in a Time of Hate", as well as "I am Cuba". Cost has combine his love of histories and mysteries into the two-book Brooklyn 8 Ballo series set in 1920s Brooklyn, New York. Cost now lives in Brunswick, Maine, with his wife, Harper. There are four grown children: Brittany, Pearson, Miranda, and Ryan. They have been replaced by four dogs. He now spends his days at the computer, writing.