A homicide investigation turns into a desperate chase to uncover a secret dating back to the American Revolution that could alter the course of history.

Detective Brian Howard thought he had just about seen it all in his years on the police force in small-town Brookhaven, Louisiana. But when a security guard is murdered at the local Reveldome Museum and nothing appears to have been stolen, Howard finds himself drawn into an intricate mystery that stretches far beyond that of his hometown. With the help of an unlikely source, he begins to uncover cryptic clues that will point him to secret societies, lost American history, and a conspiracy that could shake the very foundation of the United States. Haunted by his own family's mysterious past, Howard discovers that solving this case may just provide closure to questions that have burdened him for years.

Racing against the clock, Detective Howard and his new partner will go from the humid streets of South Louisiana to the sacred halls of Washington, DC, finding themselves unwittingly in the shadowy crosshairs of a forgotten group determined to keep the past buried at any cost. Each revelation brings them closer to a truth that has been guarded for generations-a truth intertwined with a missing piece of American history-the lost United States Capitol cornerstone. With danger closing in, Howard is forced to confront his own past while risking it all to solve a mystery that will change history - and potentially his own future.

Blending police procedural, historical intrigue, and relentless suspense, The Cornerstone is a gripping thriller filled with secrets, sacrifices, and the enduring power of truth.