Eleven-year-old twins Oliver and Celia Navel could care less about adventure and they really do not like excitement. They’d rather be watching television. Unfortunately for them, their thrill-seeking parents have dragged them from continent to continent their entire lives. But when their mother goes missing and their father makes a bet with the devious explorer Sir Edmund, the twins are forced into action. They head to Tibet where they fall out of airplanes, battle Yetis, poison witches, and encounter one very large yak. If they can unravel the mysteries and outwit Sir Edmund, they might just make the discovery of a lifetime . . . and get cable television!

Oliver and Celia Navel have suffered through a whole summer exploring with their father’s nemesis Sir Edmund, and are ready to begin a new school year glued to the TV. But when their mother vanishes (again) in search of the Lost City of Gold: El Dorado, the twins must trek from the ruins of ancient temples through the shadowy forests of the Amazon. This time, they’ll need all their reality TV survival skills to brave raging river rapids, furious fire ants, and a most unusual jungle feast. Worst of all, if they can’t outsmart the bad guys, they’re going to miss all their favorite television shows!

If Oliver and Celia Navel had any hopes this year would be less life-threatening than the last, their hopes are quickly shattered…along with their television set. When a strange scientist warns them that their mother is—yet again—in peril, it’s off to the Pacific Ocean they go. But navigating stormy seas proves easy compared to tackling a Kraken—an enormous squid—and the twins think they might have bitten off more than they can chew. In their quest for Atlantis, Oliver and Celia are in the worst trouble of their young lives; and survival comes down to one seemingly impossible task: giving a squid a wedgie.

“Thrilling and delightful!”—Pseudonymous Bosch, New York Times bestselling author The Navel Twins are at it again, for the fourth and final time! This time their travels take them to the North Pole where they are forced to sky dive, go dog sledding, get rescued by a man in a hot air balloon who looks vaguely like Santa, and finally find the long-lost Library of Alexandria. If they can get through that, they might have a fighting chance at finally going back to being couch potatoes. But that’s a tall order for the world’s most unenthusiastic siblings.