The Emperor's Code is the eighth book in The 39 Clues series written by Gordon Korman.

[1] The book's cover, revealed on March 2, 2010, shows a red mask with codes imprinted in specific areas against a purple background.

The Wizards get a mysterious message that gives coordinates, saying to go to a specific spot at the Terra Cotta Warrior's resting place.

Cora Wizard, his mother, is disgusted and slaps Jonah, telling Dan that they have discovered his branch is Janus.

Grace had stored an advanced helicopter, the A-Star, in rural China and told Amy and Dan about it, knowing they would need it in the future.