SD-6 has heard of some engineering plans done in the 16th Century hidden in a car tycoon's vault in Madrid. They send Sydney to steal those plans. However, a rival of Sydney's in the CIA, Anna Espinosa, is also vying to get the plans. As usual, Syd must deal of her moves with the CIA as well as keeping contact. And also try to know more of the truth from her estranged and mysterious father.