When their father is kidnapped and danger looms, the Strega-Borgia children, their mysterious new nanny, and a giant tarantula use magic and actual trips through the Internet to bring peace to their Scottish castle.

Time travel, a computer virus that's deadly to humans, and other strange things begin to happen when some would-be witches come to stay with the eccentric Strega-Borgia family.

When their beloved nanny disappears and their father is imprisoned for her alleged murder, Titus, Pandora, and Damp become increasingly gloomy until mysterious signs and messages that may help them resolve their terrible dilemma begin to appear around their Scottish castle home.