At the bunker, Sam is doing research on Cain and Abel while Dean tries to reach Crowley to find out if he's found the First Blade. Sam points out that Crowley isn't a team player, and Dean plays back a message Crowley left him where the demon is apparently drunk. Dean tries to call again.
Crowley is in bed with a demon, Lola, and hears his cellphone rings. He ignores it and tells Lola to get his treat. She goes to the closet and extracts some blood from a man who is gagged and tied to the pole. Lola warns Crowley that he's almost empty and they'll need a volunteer, and Crowley tells her to take care of it as he injects himself with the blood and then lies back.

Later, Lola returns with food and finds Crowley watching Casablanca and crying.
Sometime later, Lola goes to a warehouse and meets with Aldo, one of Abaddon's minions.Aldo tells Lola that Abaddon is busy but that he'll relay the information to his mistress. Lola reluctantly tells him that Crowley is all but useless, and that Dean keeps calling asking about the First Blade. Aldo tell her that she's done well and orders her to continue reporting. She agrees but warns that she'll expect to report directly to Abaddon next time.
Sam and Dean go to a crossroad and draw a devil's trap, and then try to summon a crossroad demon. A female demon appears and they realize that she's Snooki. Sam takes out the demon-killing knife and says that she can tell them about Crowley, or they can torture her and then she can talk. Snooki finally tells them that he's somewhere in the Western Pacific, and warns that even the loyalist demons in Hell are looking to Abaddon. Satisfied, Sam then performs an exorcism on the demon inside of Snooki.

Lola returns to Crowley's hotel room and shows off her new dress and necklace. She has a blood bag for him and fills up Crowley's syringe, and he telekinetically shoves her into the bedroom. Crowley tells her that he knows she sold him out to Abaddon and he could have helped her. Disgusted, Lola says that he's useless and Crowley kills her, and then injects himself with the blood. He glances at the desiccated human bodies lying around the room and then at himself in the mirror, crying.
Back at the bunker, Sam wonders if Crowley is trying to double-cross them. Dean points out that Crowley set it up for him to kill Abaddon, and Sam suggests that they use the First Blade on Crowley. Crowley calls and tells Dean that he's in trouble and needs their help.
The Winchesters drive to the hotel where Crowley is staying and break in while he's out. When Crowley returns with a brown paper bag, Sam takes it and confirms it has a blood bag in it. The brothers chain Crowley to a chair and tell him that he needs to focus. The demon explains that he's addicted to human DNA and that Lola reported everything back to Abaddon. Crowley admits that he doesn't remember if he mentioned the First Blade to Lola, and the brothers figure that Abaddon is looking for it as well. Dean tells Crowley that he's going cold turkey.
Back at the bunker, the Winchesters put Crowley back into his old cell. Sam questions him about where he searched. Crowley discovers that an unmanned sub picked up the blade, and it eventually made its way to a pirate. As Sam tries to track it down, Crowley stares at him and admits that they're bonded because he drank Sam's blood. Sam insists that they're not in any way close and goes back to work.

Later, Sam and Dean release Crowley and take him to a park where they're to meet with Andre Develin, a black marketer who bought the First Blade from the pirate. Crowley starts stealing candy from a vending machine until Dean tells him to shape up. Andre arrives and the brothers claim that they're with the FBI. As the man stalls, Crowley leaps into his body, reads his mind, and then returns to his original body. Sam realizes what happened and lets Andre go. Crowley then tells them that the First Blade is at the National Institute of Antiquities in Kansas City, MO.
At the Institute, two demons take over the security guards and open the vault containing the First Blade. The research assistant on duty comes in and one of the demons cuts her throat.
Later, the Winchesters hear about the three dead workers at the Institute. They go there and the detective in charge shows the brothers video of the guards killing the assistant and then shooting each other before destroying the security camera. The detective says that Dr. McElroy, the curator, said there's been nothing in the vault for weeks. Once they're alone, the Winchesters figure that the guards discovered the vault was empty and reported back to Abaddon.
Sam and Dean talk to Dr. McElroy, who says that no authenticated blade was at the Institute. The Winchesters claim that the blade was smuggled and the older woman flirts briefly with Dean. Dr. McElroy admits that she had the First Blade but carbon dating was unreliable. She removed it from the vault herself and the guards didn't know, and she received a confidential order several weeks ago to buy it. McElroy refuses to tell them the name of the buyer until Dean flirts a bit. She says that a man using the name Magnus was the buyer and gives Dean her number in case he needs anything else. Once they're alone, Sam reminds Dean that the Men of Letters use the name Magnus when they're incognito. Dean points out that they're all dead, but Sam isn't so sure.

The Winchesters go back to the bunker and ask Crowley if he knows anyone who survived the Men of Letters massacre in 1958. Crowley isn't happy that they're demanding more information and insists that they owe him because they made him a junkie. They ask what he wants and Crowley has them get him a Scotch. The brothers go through the 1958 membership records and Crowley says that there were rumors that a rogue member was tossed out and wouldn't be on the active list. Dean finds the list of exiled Men of Letters and they come up with the name of Cuthbert Sinclair. Cuthbert designed most of the warding that kept the bunker safe, but his later research was all rejected by his superiors for being too eccentric. He was exiled two years before the massacre. Crowley admits that he tried to track down the man to get into the bunker, and tells them where he looked.
Crowley takes the brothers to a clearing in the middle of nowhere. The demon can't sense Cuthbert through the ward, but Dean and Sam figure that he's watching them. They announce that their legacies, the grandsons of Henry Winchester, and ask to hear his side of the story. After a moment, a portal opens and the brothers step through. They find themselves in a spacious manor and follow the sound of a phonograph playing. Two humanoid monsters attack them and the brothers have no choice but to call them. Sinclair congratulates them and calls them into his study. He explains that his fortress is invisible and uses a spell to keep himself relatively young. Sinclair admits that he released the two creatures from his zoo and that he has a vast collection of supernatural antiquities. Sam explains that they're hunters and Sinclair explains that he was Henry's mentor and Henry visited him in secret.

Dean explains about Abaddon and how they need the First Blade to stop her. Sinclair points out that it's useless without the Mark of Cain, and Dean shows it to him. Sam points out that Abaddon won't spare anyone, including Sinclair, and he shows them the blade in his collection. Sinclair teleports Sam away with a spell and tells Dean that he's fine. He explains that he wants the Mark of Cain as well... and Dean as part of his collection. Sinclair wants to take Dean on as a student. When Dean refuses, Sinclair points out that his manor has no doors or windows. When Dean takes out his knife, Sinclair superheats it with a spell and pickpockets his gun, and welcomes Dean to his collection.
Sam goes to the trunk of the Impala while Crowley looks on. Crowley talks about how they're team now, Sam points out that they're not friends and Crowley is useless because the manor is warded. The demon offers to help anyway and Sam refuses, and Crowley reminds him that he has been doing more than Sam is. Sam is going through a box of files and tells Crowley to shut up and let him concentrate.
Dean tells Sinclair that he's worse than the Men of Letters, hiding away in his invisible manor. Sinclair offers him the First Blade and suggests that they activate it. He finally puts it in Dean's hand and the Mark glows. After a moment he drops it and Sinclair assures him that the next time it will be easier.
That night, Sam finds a reference to Sinclair trying to seal the bunker to everything except spells. He realizes that they need some components and tells Crowley that he can finally be useful.

Sinclair tells Dean that they're invincible now that they have the First Blade. Dean threatens to cripple him, and Sinclair touches his head and casts a spell, stripping him of his will.
Crowley gets the spell components and tries to get Sam to thank him without success. Sam casts the spell and tells Crowley to stay close. They step through the portal into the manor, and hear someone approaching. Sam and Crowley hide as Sinclair walks by, and then Sam grabs him and holds a knife to his throat. Sinclair takes him to the study and the paralyzed Dean shouts a warning. The "Sinclair" Sam has is a shapeshifter, who tries to attack Sam. Sam kills him and Sinclair aims Dean's gun at him. He admits that Sam is more valuable than he thought he was, and plans to use torture Sam to force Dean to cooperate. Crowley sneaks in and frees Dean, who decapitates Sinclair with the First Blade. The Mark of Cain glows and Sam tells his brother that it's over and he can drop the First Blade. After a moment, Dean manages to do so.

The next day, the trio leave the manor and Crowley spends his time congratulating himself. They discover that someone has keyed ancient Enochian into the side of the Impala. Crowley explains that it's a message for him from Abaddon, telling him to be afraid. Sam whispers to Dean that they agreed that Crowley was only useful until they got the blade. When they turn to the demon, he pins them against the car. Crowley tells them that now that he's sober, he's figured that they'll kill him as well. He summons the First Blade to his hand and tells the Winchesters that he'll hang onto it until they find Abaddon, and then teleports away.
