The Lost Treasure of the Yucatan
Ned and Bass are lost in a cave-in at a Mayan temple ruin in the Yucatan. While they attempt to find their way to safety through pitch darkness, Nell and Sam make a startling discovery that helps a Mayan village rediscover a major part of its heritage.
— Publication Date: 2016
The Lost Treasure of Mesa Verde
The Nodds are helping an old friend repatriate a collection of Native American artifacts and discover a previously unknown water source in the heart of the Green Mesa. Along the way, Sam gets sacrificed to a fire demon and Bass finally learns to swim (of course, in the desert).
The Lost Treasure of Shangri La
The family is visiting a panda preservation center when a nearby earthquake reveals what may be one of the lost cities of refuge in the Himalayan Mountains.