Carl Constantine Kosak (19342023), better known as acclaimed mystery writer K.C. Constantine, is famed for his mysteries featuring Mario Balzic. Constantine showed much more interest in the characters in his novels than the actual mystery, and his later novels became ever more philosophical, threatening to leave the mystery genre behind completely. In 1989, Constantine was nominated for the Edgar Allan Poe Award for Best Novel for Joey's Case. Despite his success, he managed to keep his literary identity completely hidden until 2011 when he appeared in person for the first time at the annual Festival of Mystery hosted by Mystery Lovers Bookshop in Oakmont.
An Edgar Award nominee’s “best [mystery] yet—an understated small town tragedy handled in his level—dead-level—fashion” - Kirkus Reviews “Constantine is a marvelous writer. May Mario Balzic thrive.” — The New York Times “K.C. Constantine is one of the most talked about mystery writers on the American scene. Constantine has a smooth style, and his plots are loaded with unexpected twists and turns.” ― Boston Globe“Constantine writes a terrific mystery.” ― Providence Journal