On assignment in the Middle East, television journalist Cotten Stone stumbles upon an archeological dig that uncovers the world's most-sought-after religious relic: the Holy Grail. With his last dying breath, Dr. Gabriel Archer gives it to Cotten, uttering "You are the only one" in a language she's heard from only one other person—her deceased twin sister. What begins as a hot news story for the ambitious young reporter soon turns into a nightmare when the Holy Grail is stolen and strange "accidents" befall her dearest friends.