Mary asks Sam, Dean and Castiel for help on a case she's working, but neglects to mention the British Men of Letters are involved. When Mary is double crossed, everything is revealed.
Sam & Dean join Mary on a hunt for a particularly demon, but things aren't what they seem as they are soon joined by Crowley and his demons. As Castiel is taken out and may be doomed~! Who is the Prince of Hell? What is it that makes him the scariest most deadliest demon they have ever faced~?—stephen scialli