Mark Greaney is a best-selling writer of thrillers. He co-authored several Jack Ryan novels with Tom Clancy, and even continued the series for several years following Mr. Clancy's passing. Some of his other titles are Red Metal and Armored, but he is best known to Book Talk listeners as the author of The Gray Man series of books starring the burned CIA operator, Court Gentry. 2026 brings us the 15th installment in the series, The Hard Line.