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A young couple in St Paul, Minnesotaare Minnesota, are walking in a shopping district near a new housing development. The woman hears a baby crying from across the street in an abandoned house. She follows the cries inside, and in a crib finds an old doll. Her husband The man comes as she is leaning over the crib. Before they can leave, the door slams shut and they scream as an unknown something comes after them.

Mary is sitting in the bunker library reading John’s journal in the middle of the night. Cas comes in she asks him how long it took him to feel as if he fit in, belonged here. He tells her still isn’t sure he does, but that she does belong.As she readies for bed, Mary stares at herself in the mirror awhile before beginning to cut her hair.In the morning, the boys are at the kitchen table. Cas comes in. and tells them he is off to Cleveland in his search for Lucifer because he feels he is the reason [[Lucifer ]] escaped.Mary joins the boys for breakfast and says she found a hunt in Minnesota, -- victims whose hearts were frozen after entering an old abandoned house. They head out, and stop for gas and snacks. Dean introduces Mary to several beef jerky flavors, having a mother son bonding moment. As Dean starts up Baby, Born to be Wild is playing, a little loud. Sam- in the back seat- tries to tell Dean to turn it down, but before he can get his point across, Mary leans over and cranks it up. Dean, happy, peels out and they drive off toward the case.

Cas is interviewing Tommy, a member of rock star Vincent Vincente’s [[Vince Vincente]]'s band. Tommy tells Cas that Vincent Vince physically threw him from the room, and that he had strength like an MMA fighter, or like he was 20 again. He’s He's sure, it wasn’t wasn't Vince. Cas asks Tommy to call him if he remembers anything else and gives him a card. The rocker scoffs, ‘ok…"Ok... Agent Beyonce” Beyonce." As Cas leaves the lobby, passing by the bar, [[Crowley ]] calls out to him, ‘guess "Guess that makes me agent Jay Z’Z."

Mary Crowley tries to sell Cas on hunting Lucifer together. He wheedles, reminding him that they haven't tried to kill each other in ages, and they handled the boys are at the coroners’ office, where Darkness together well. Crowley tells Cas he explains the victims’ hearts were literally frozen. The boys note has a frostbite burn in the shape of a handprint on the victim corpse on the exam tablelead, an address to check out for Vince's sister.

Cas and Crowley arrive at the home of Vince Vincente's sister. She slams the door in Cas's face and immediately calls "Vinny," telling him federal agents are looking for him and he's in trouble. Crowley tries and Cas enter the house through their own means, and Cas is able to tell that she was recently healed. Crowley notices an abandoned wheelchair and deduces that she has been healed to walk again. He threatens to sell undo the cure, but Cas on hunting Lucifer togetherstops him. He wheedles how they haven’t tried Cas explains to kill each other in agesthe woman that it wasn't Vince who healed her, it was something ancient and evil. She admits that he'd acted strangely, coldly, while he was there, and they handled the Darkness together wellthen mentions that he'd had a red-headed "groupie" with him.Crowley tells Cas he has a leadthey need to go to Vince's cabin in Sagamore Hills, an address to check out for Vincent’s sisterOhio.

Mary and Back at the boys head to motel, Sam suggest the abandoned house. They all have EMF detectors. and children's spirits are checking the place out"mylings," from Scandinavian lore. Mary turns away from disagrees, saying that she didn't think the boyslittle boy wanted to hurt her, heading into the bedroomhe was scared. She sees Sam and Dean still think they're dealing with vengeful child spirits, and they will need to salt and burn the crib and checks around itbodies. As Mary turns to talk it over, she approaches the cribgrows lightheaded for a minute and stumbles, she sees seeing visions of the light above it flickering. She notices the sudden drop in wind chill just before she uncovers the doll in the crib. The door slams shut last moments of her earlier life as well as she pulls of the blanket back, and she calls out. The boys cant get into to little boy who grabbed her. Finally Sam and Dean shoots suggest she stay back at the lock hotel and as get some rest while they finally break in, a child ghost grabs Mary’s arm and she gets hit the cemetery to look into the frostbite burn markchildren's bones.Back at After the motelboys leave, Sam Mary makes some calls and Dean are both working on laptops, when Mary suggests them heading out is able to knock on some doors, canvas track down the neighborhood, work former owner of the case. But Sam house and Dean explain that now, they can find out most all about the death of what they need a 4-year-old boy there. His mother describes a scar on his cheek and it confirms for Mary that [[Lucas Kellinger]] was the internetghost who grabbed her.

Cas Mary's gone back to the house on her own. She sees Lucas and Crowley arrive at , leaving the home of Vince Vincente’s sister. The woman is duffel bag in the entry, follows him deeper into the house on the phone, trying down to call “Vinney” telling him federal agents are looking for him and he’s in troublethe basement.. Cas is able to tell that she was recently healed. Crowley figures out it was Lucas tells her legs, she has been healed to walk again, and he threatens to undo 's cold. Her cell rings -- it, but Cas stops him's Sam calling. Cas explains to Mary tells the boys she is at the woman that it wasn’t Vince who healed herhouse but before she can explain more, it was something ancient the signal goes out and evil. She describes him having a red headed woman with him.Crowley tells Cas they need the boys rush out from the room to go head to Vince’s cabin in Sagamore Hills, Ohio, where he wrote his best hitsthe house.

At a cabin Mary is in the woodsbasement with Lucas and asks what is keeping him there. He tells her, Vincent/Lucifer "he is checking his reflection " and asks Rowenapoints out an area of wall. The ghost of a man comes forth. Mary recognizes him as one of the homeowners, [[Hugo Moriarty]], chained in but when she tries to confront him about killing all the front roomchildren, if he chokes her. Sam and Dean arrive at the house as she has any beauty spells in falls, and when they try to help her witchy brainshe tosses Dean aside. His vessel is starting to wear Sam sees ectoplasm leaking from her eyes and figures outMary’s been possessed. He wants Rowena Mary is able to make fight the vessel permanentspirit off briefly, strong long enough to hold himtell Sam to check the basement. Then the spirit takes over again and she comes after Dean. He threatens can't bring himself to break shoot her neck with the salt gun, but when she turns away from Dean to go after Sam in the basement, Dean wraps her up in iron chains. Sam rushes down to the basement. Lucas is there, pointing again to a section of the wall. Sam knocks a hole in the wall and tear her head off if she refusesfinds a body, which he salts and burns, and the spirit is forcefully ejected from Mary. With the killer gone, the spirits of all the dead children are freed too and each glows brightly before ascending up out of the house.

Back at the motel, Sam suggest the children’s spirits are “mileys”, from Scandinavian lore.. Mary tries to explain to the boys that she didn’t think the little boy wanted to hurt her, he was scared. Sam and Dean explain they think it’s vengeful child spirits, and they will need to salt and burn the bodies. As Mary turns to talk it over, she grows lightheaded for a minute and stumbles, (She sees a vision of the little boy who grabbed her). Sam and Dean suggest she stay back at the hotel and get some rest, while they hit the cemetery to look into the children’s bones.After the boys leave her, Mary makes some calls and is able to track down the former owner of the house and find out all about the last death of a 4 year old there. She also describes a scar on his cheek and it confirms for Mary that Lucas was the ghost who grabbed her.  Sam and Dean are at the cemetery, digging up the children. They discuss about whether their mother is struggling versus simply adjusting. Sam’s worried, but Dean cuts him off. He just wants to be happy with her return. Sam explains his worries she is turning to hunting to avoid dealing, and tells Dean it’s a family trait.The boys return to the hotel, but when they get there, Mary is gone. They check the room, no sign of struggle, and no note. Then, Sam sees the weapons bag is missing….Mary’s gone back to the house on her own. She sees Lucas and, leaving the duffle bag in the entry, follows Lucas direction to go deeper into the house, down to the basement. Lucas tells her he’s cold. Her cell rings, it’s Sam calling. Mary tells the boys she is at the house but before she can explain more, the signal goes out and the boys rush out from the room to head to the house.  At the cabin, Rowena is painting sigils onto the chest of Lucifer’s vessel, explaining her spell will make it last. As Rowena completes the spell, he realizes something is wrong and she tells him she accelerated the decay, making him age super-fast. She waves her hands and he vanishes.  Mary is in the basement with Lucas and asks what is keeping him there. He tells her, “he is” and he points out an area of wall. A ghost of a man comes forth. Mary recognizes him as one of the homeowners, Moriarty, but when she tries to confront him about killing all the children, he chokes her. Sam and Dean arrive at the house as she falls, and when they try to help her she tosses Dean aside. Sam sees ectoplasm leaking from her eyes and figures out Mary’s been possessed. Mary is able to fight the spirit off briefly, long enough to tell Sam to check the basement. Then the spirit takes over again and she comes after Dean. He cant bring himself to shoot her with the salt gun, but when she turns away from Dean to go after Sam who is working in the basement, Dean wraps her up in iron chains. Sam rushes down to the basement and salts and burns the bones and the spirit is forcefully ejected from Mary. With the killer gone, the spirits of all the dead children are freed too and each glows brightly before ascending up out of the house.  Crowley and Cas enter Vincent’s cabin and find Rowena on the patio. She tells them she double crossed Lucifer and sent him to the bottom of the ocean, and while she refuses to actively work with them, she says if they corner him and need her help, call, she’ll be there.  As they come back to the bunkerBunker, Dean tells Mary she kicked ass, and she was right about the kids, though they still didn’t didn't know what Moriarty’s Moriarty's motive was. Mary tells him she does. She explains says that when Moriarty possessed her, she was able to see his story and the strength of his grief.Dean tries to reassure Mary, telling her “it’s "It's ok, you’re home now,” " but she tells him no, she’s she's not home. Mary explains that she is grieving for baby Sam, her little boy Dean , and John. To her, she was just with her family, in heavenHeaven, but they’re now they're gone. “Every "Every moment I spend with you reminds me of every moment I lost with them.” " She explains that she thought hunting would clear her head, but it didn’t didn't work. She explains says that she loves them, but that she needs some time alone. She takes her duffle duffel and leaves.

'''Crowley:''' Why not? We made a somewhat effective team against Amara. It's been months-I mean months-since we last tried to kill each other. We've both got very, very good reasons to want Lucifer dead. Besides... While you were gabbing with Vince's second fiddle, I was ransacking his room. Found these. Postcards from his beloved sister Wendy. Oh looky lookie here, an address and everything. Worth a look?