A girl has been chosen to hear the angels' conversations and the brothers must find her quickly before a powerful demon named Alastair (guest star Mark Rolston) comes and makes use of her ability. "Supernatural" 4.09 chronicles Sam and Dean's journey to find Anna with the help of Ruby.
Mid the mission, the threesome was attacked by Alastair and Ruby escapes with the girl. This prompts Dean to believe that they are set up, but Sam explains to him that they should trust Ruby and tells him what happened while he was in hell and how Ruby saved his life. Meanwhile, Castiel and Uriel return and demand to be taken to Anna but not for the reason Dean thinks.
"I Know What You Did Last Summer" will go on air on November 13.