Carlita Garlucci is thrilled that her son Tony has arrived in Savannah to help with the opening of their new pawnshop Savannah Swag. While giving her son a tour of the property, they stumble upon a hidden trapdoor that leads to an undiscovered basement with a tunnel.

Curious to find out where the tunnel leads, Tony breaks through the wall and discovers underground passageways rumored to have been used by pirates to smuggle their stolen goods into the historic city. While exploring the tunnel, the Garluccis find skeletal remains with ties to a darker secret that has been hidden behind the tunnel walls.

The gruesome discovery causes Carlita to wonder what other secrets her property holds. Despite her insistence that they reseal the tunnel, Carlita’s children convince her to leave it open long enough for them to explore the passageways as they attempt to solve a decades-old mystery.

They quickly discover that the secrets hidden underground are tied not only to the previous owners of her property but also implicate Carlita's deceased husband Vinnie.

Will Carlita and her children be able to clear Vinnie's name, or will their snooping around incriminate him even more?