Presents the life of Ada Lovelace, the daughter of the poet Lord Byron, who became a gifted mathematician and who together with Charles Babbage developed an analytic engine that was the world's first computer.

Jack, Ben, and Emily travel to Mexico, the seat of the vampire god Camazotz's power, on a desperate quest to locate the last remaining piece of an amulet that, if found by Camazotz, will give the vampire untold strength and power.