Jeff Alt

In the fourth book of this award-winning national park series, Tommy "Bubba Jones" and his sister, Jenny "Hug-a-Bug," uncover amazing facts about the Grand Canyon while on a mission to solve a park mystery. This is no ordinary brother and sister duo; they are part of a legendary time travel family with a mission to preserve and protect our national parks and have developed a reputation for solving mysteries. As they time travel back hundreds, thousands,...