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


雖然父母是一對舉世聞名的探險家，但十一歲的雙胞胎希莉亞和奧立弗卻對冒險毫無興趣，只喜歡看電視。於是父親帶他倆去西藏，一同搜尋失蹤已久的母親。