Unable to close his previous case against the Monument Bomber, Senior FBI Special Agent Zane Rigby has been re-assigned to uncover a secret. Is Abraham Lincoln's body in his grave? When DNA from a hand found with a blackmail note traced back to 1901 matches the DNA from bone taken at Lincoln's autopsy, Rigby is shuffled off to Springfield, Illinois where all manner of obstacles threaten his success. He discovers a local congressman hiding a dreaded secret, a strange doctor who claims he can perform medical miracles and his own ill-timed urge to rekindle a relationship with his college sweetheart. And then there is the dead body of a young woman found near Lincoln's Tomb. As the Monument Bomber threatens to strike again, Rigby searches for redemption in solving the murder and discovering the secret buried in Lincoln's tomb.