Secrets buried in the Driftless don’t stay hidden for long.

Since 1904, Tiffany experts have searched for a set of authentic stained-glass windows lost after a fire destroyed a lumber baron’s mansion in Oshkosh, Wisconsin. When La Crosse expert Geoff LaSarde is attacked in a violent home invasion, Lt. Jim Higgins initially suspects a routine robbery—until a missing suitcase points to something far more valuable.

Treasure hunter Jamie Alberg sees what others don’t and begins to uncover clues tied to the long-lost windows. But when Jamie is abducted by a ruthless underworld kingpin determined to claim the prize, the investigation turns deadly.

As time runs out, Higgins and his team must unravel a century-old mystery before it leads to devastating consequences.