It starts when an old man is driving in his car in the middle of the desert when he sees a dying man suddenly appear in front of him. He's ice cold and doesn't live at the hospital. All that was found on him was a cross-necklace with ITC on it. The only thing the man said was Castlegard.
A group of archeaologists are working in the ruins of La Roque. One of these archeaologists, the professor, goes missing for three days. Two others, Kate Ericson and Andre Merrick, go into a room in the ruins of a monastery and find an old document. When Josh Stern, a physacist, clears up the writing, Chris-professor's son-Kate and Merrick see the professor's handwriting pleaing for help. The three and Francois, their friend, go to ITC and Donneger-starter of ITC-tells them that the professor is back in 1357 Castlegard, France. The four and ITC employee Frank Gordon and his marine friends go back in time to find the professor and help the French to win the war against England.