A cursed Aztec dagger. A five-hundred-year-old witch's riddle. And a . . . screaming sombrero?

These are the ancient artifacts that mysteriously hold the answer to the location of the priceless El Dorado treasure hidden in New Mexico--not far from where Jorge and Carter live. When their friend Ernie's dad is accused of stealing the artifacts, it's a race against time to clear his name. They find help from the unlikeliest--and loudest--source they've ever met: a sombrero that SCREAMS!

Together with brainy Liza, the oddball heroes discover the real culprits are a devilish ring of thieves who are after El Dorado's treasure. The pals lay a cunning trap to make the thieves confess, but they realize too late that they're the ones being trapped . . . and there's no one left to save them!