Olivia Hart lives a peaceful life as the librarian of a quiet Colorado town until she accidentally discovers a hidden staircase beneath the library shelves. The secret room leads to a network of tunnels buried beneath Brookdale and documents that reveal a shocking truth about the town's past. As Olivia follows the mystery deeper underground, she uncovers a century old cover up that powerful people tried to erase from history. In the end her discovery changes the town forever and proves that sometimes the greatest adventures begin in the quietest places.