It is 1924, and the small town of Monticello, Indiana, offers little excitement to sixteen-year-old Emmett Trentham and fifteen-year-old Billy Mac Finch who usually have to create their own brand of entertainment. But when the teenagers stumble onto a decaying log cabin hidden deep in scrub, everything changes.

As Emmo and Mackie explore the inside of the cabin, they hurl bricks at the fireplace, creating a large hole that reveals a secret room. After they slip into the tiny dark crack to investigate further, they are surprised by Maddie Miller, the great-granddaughter of the cabin's owner, who has arrived after hearing the loud noises. As soon as the three friends discover an old Indian tomahawk pipe and a hand-drawn treasure map, they begin unraveling a perplexing mystery that includes the great Shawnee leader Tecumseh and a real-life legend of buried Indian treasure.

In this adventurous historical tale, Emmo, Mackie, and Maddie enter an unfamiliar world of ghosts, suspense, betrayal, and danger as they begin an unforgettable journey to help fulfill an ancient promise.