When their robot classmate, Ro-Bud, gets a computer virus, the Code Academy gang is determined to help her. Along the way, they learn what a virus is, and how "hackers" break into computers to steal information or cause damage. This easy-to-follow book simplifies computer concepts to help readers learn why it's important to keep passwords secret to protect computers. Provided by publisher.

Includes index.

Registration -- Morning lesson -- Lunchtime! -- Afternoon lesson -- To the whiteboard! -- Jia gets in -- Hack attack! -- All sorted -- Homework -- Look it up!.