Why is the fifty-year-old secret of a missing military transport plane motivating some desperate men to begin setting deathtraps for Bill Travis, his client Holt Gatlin, and anyone else involved? To what lengths will they go to stop Bill for good? Does Holt Gatlin hold the cure to mankind's myriad diseases and possibly the answer to immortality itself, or is he instead the host for an ancient evil? To find the answer Bill must have the help of the most unlikely sidekick of all. Caddo Cold is the seventh installment of the Bill Travis Mysteries.