He was murdered for a secret—one he took to his grave.

200 years later, that secret is haunting him again.

Meriwether Lewis was murdered. The organization behind it has been growing quietly in the shadows. And only Harvey Bennett and the CSO can stop them.

Harvey "Ben" Bennett is back, and he's not alone. His new team—the Civilian Special Operations—is putting the finishing touches on their new headquarters when they receive a call: There's been a murder. And in its wake, a seemingly insignificant artifact has been stolen.

Ben and company make their way to Philadelphia to investigate the death and are greeted by a modern-day American Philosophical Society—and learn that they are protecting a deadly secret that reaches back through history to the Founding Fathers themselves.

What was the secret that Meriwether Lewis died for?

And why are so many willing to kill for it today?