Higgins wants Magnum to find the "Lost Art of the Ancients", a priceless ancient scroll from a fallen civilization, that could spell disaster if it should ever fall into the wrong hands. But the search for the long lost artifact is laced with abduction, danger and deceit, as an old flame of Magnum's, a foreign double agent, and a ruthless rival of Higgins' are all out to find the scroll as well, and the dangerous path to unearthing it could ultimately lead to death.

Magnum ponders his future while paying a visit to his family in Tidewater, Virginia, where he unexpectedly meets his grandfather and considers an offer to be reinstated to the Navy. Thomas returns to Hawaii to ascertain whether former girlfriend Linda Lee Ellison is being stalked, while Rick prepares for his wedding to Cleo. As Thomas and Linda renew their relationship as he searches for her stalker, he becomes increasingly certain that his daughter Lily may still be alive.