City of the Beasts is the story of 15-year-old Alexander Cold and 12-year-old Nadia Santos. Alex is spending the summer with his eccentric archaeologist grandmother, who has been hired to find and write an article on the mythical "Yeti of the Amazon." While on the expedition, the two teens are kidnapped by the "People of the Mist" and enter a mountain to discover the mythical city of El Dorado and the enigmatic "Beasts."