Matt Cost

Matt Cost, aka Matthew Langdon Cost, writes the Mainely Mysteries and the Clay Wolfe/Port Essex Mystery series. He’s also written several books of historical fiction, including I Am Cuba, At Every Hazard, and Love in a Time of Hate. Velma Gone Awry: A Brooklyn 8 Ballo Mystery is his first jaunt in combining his two loves of histories and mysteries into a historical private eye tale. His newest Mainely Mystery, Mainely Wicked, was just published on August 9, 2023.

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 now that’s what he does: He writes histories and mysteries.

Cost now lives in Brunswick, Maine, with his wife, Harper. There are four grown children: Brittany, Pearson, Miranda, and Ryan. A chocolate Lab and a basset hound round out the mix. For the latest news, follow Matt Cost on Facebook, on Instagram @mlangdoncost, and visit

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