In 15th-century Mesoamerica, Donají and Itzcacalotl travel to the Oracle of Lyobaa in the hopes of learning the secret behind Donají's missing father. But instead of receiving information, they find themselves roped into a quest to stop the assassination of the great Emperor Ahuizotl! This is easier said than done when faced with a mysterious group of black-clad killers who want nothing more than to send the known world tumbling into chaos.

Along the way, the two will have to navigate new friends, old enemies, and corn people as they try to save the emperor...before it's too late!