Safe House (Supernatural)

A woman, Naoki Himura, is scraping old wallpaper in her new house when she hears a scream and runs up to her daughter's bedroom. The girl, Kat, tells her mother that there is something bad in the house, and complains about how cold her room is. After the mother leaves to get her a glass of water, the lights in Kat's room go out and her door slams shut. Kat hides under her bed, watching the shadow of someone walking in front of her door. The door is suddenly opened, followed by a pale hand snatching Kat away.

After getting no information on Castiel or Amara, Sam and Dean decide to take up the case of a little girl who went into coma and the only sign of any trauma is a handprint on her ankle.

On reaching Grand Rapids, Michigan, Sam and Dean realize that Rufus Turner and Bobby Singer worked the same case a couple of years ago and consult Bobby's journal but it doesn't contain any information about what they were hunting.

In the past, Rufus and Bobby argue over the case. Bobby believes it's a simple ghost case while Rufus now thinks it's a baku. They bet a bottle of Johnnie Walker Blue Label Whisky on it, then head off to dig up some bones. On two separate nights, two pairs of hunters are digging up the same graves. Sam and Dean open the first casket and find that the bones have already been burned. They dig up the second grave and find that the bones have been burned as well. They come to the conclusion that they're not hunting a ghost after all.

After the mother is also attacked and goes into a coma, the brothers, after consulting the lore find that they are dealing with a soul eater. Bobby and Rufus figure it out too. While Bobby and Rufus can't find a way to kill the creature, Bobby had previously worked a case in Tennessee where he fought what he now realizes is a soul eater and he was able to trap it. In the present, the Winchesters realize that Naoki broke Bobby and Rufus' sigil while redecorating and accidentally released the soul eater. In the Men of Letters archives, Sam finds a second sigil that can kill the soul eater, but one of them must enter the soul eater's nest to paint the sigil there at the same time it is painted in the house.

In the past, Bobby and Rufus begin painting the sigil, only for Bobby to come under attack and get dragged to the nest where he has visions of the Winchesters dead and meets the young boy taken by the soul eater at the beginning of his case. He is soon possessed by the soul eater and used to attack Rufus. Rufus manages to subdue the possessed Bobby and finish the sigil, trapping the soul eater and sealing its nest.

In the present, as Sam works on his own sigil, Dean purposefully goads the soul eater into dragging him into its nest where he meets Kat. Dean completes his sigil, but is possessed by the soul eater to attack Sam. The soul eater shows knowledge of the Darkness and warns Sam that Dean is driven to go to the Darkness. Sam subdues the possessed Dean and completes his sigil, killing the soul eater. Inside of the nest, the souls of all of its victims are released to their final rest or their bodies if they are still alive. Watching the souls disappear, Dean and Bobby briefly encounter each other before being returned to their own bodies in their respective time periods.

In the past, Bobby puts up wallpaper to cover the trap sigil while Rufus check on the family to discover that they are now okay. Bobby is left worried by the implications of his encounter with Dean and how everything seems to have ended too neatly. In his car, Bobby finds a bottle of Johnny Walker Blue from Rufus (later discovered by Sam and Jody Mills in season 7's Time after Time) and begins to write about the case in his journal before being interrupted by a call from Dean. At Dean's request, Bobby heads off to check on a lead on Lilith.

In the present, the Winchesters find that Naoki and Kat are awake as well while Dean speculates on whether or not he actually saw Bobby in the nest, a place that exists outside of time and space, making it theoretically possible. Departing, Sam and Dean decide to revisit Bobby's old soul eater case in Tennessee and finish it for him by killing the soul eater that he had trapped there.