Supernatural: The Unholy Cause is the fifth tie-in novel in the Supernatural series. The story that shows a previously unseen adventure for the Winchester brothers that takes place during Season 5 of the TV series. It was written by Joe Schreiber and published on May 4, 2010.
Way back in 1862, Confederate Captain Jubal Beauchamp leads a charge across a Georgia battleground... Fast forward to present day and a Civil War re-enactment on the same site becomes all too real. When Sam and Dean head down South to investigate, they discover that the past really isn't dead...