Alex Hawk spent a decade trying to return from Kragdon-ah. Now he is safely back in the twenty-first century with daughters Amy and Sanda and his loyal, giant dog. All is peaceful and good until, ten years later, Alex hears an incredible commotion in the basement where the door into time still stands safely behind a brick wall. The wall has fallen. A giant warrior has stepped through and uttered four words in a language Alex has almost forgotten: "Manta-ak! We need you!" Warrior of Kragdon-ah is the fourth book in the Alex Hawk Time Travel Adventure series. This time, Alex will not step through the door alone.