Castiel finds Jimmy’s daughter Claire in a group home and she convinces him to break her out. After she runs away from him, Castiel calls Sam and Dean to help find her before she gets in trouble. Meanwhile, Crowley faces his biggest challenge yet.

After the massacre at the ranch, Dean, Sam, and Castiel double their efforts to find a cure for the Mark of Cain but there is nothing in the lore that can help them. Desperate, Castiel comes up with an idea that Sam deems the "single worst idea I've ever heard." Meanwhile, Rowena continues to plot against Crowley, and Castiel tries to mend his relationship with Claire who is plotting revenge against Dean for killing her friend.

When Claire Novak gets a lead on her mother, Amelia, who has been missing for years, Castiel asks Sam and Dean to help her. Castiel feels guilty for what he did to the Novak family and wants to make amends by reuniting Claire with her mom. However, when they find out what took Amelia, they realize there is a chance Claire may not get her happy ending.

Sam and Dean drop in on Jody Mills, Claire and Alex after receiving a panicked phone call from Claire. She believes the recent murders in town are supernatural and wants the boys’ help. However, Sheriff Mills tells Sam and Dean that Claire has been getting into trouble lately as she’s been attacking normal people and accusing them of being monsters.

Sam and Dean let Mick Davies tag along on a case as they search for a werewolf. The three men run into Claire Novak, also working the hunt. However, the reunion is short lived after Claire is bitten and the brothers race to find a way to help her before she turns.

When Sam and Dean go missing, Jody Mills calls Claire Novak, the rebellious rogue hunter, and tells her it is time to come home – they need to find the Winchesters. Claire returns and reunites with Alex Jones, who has stayed behind with Jody and tries to balance a “normal” life with being a part time hunter. While Jody is happy to have Claire home again, she’s plagued by Patience’s disturbing vision involving her adopted daughter. Claire and Alex search for Kaia Nieves, the dreamcatcher responsible for opening the rift that Sam and Dean went through, as she holds the key to their whereabouts. Jody calls her friend, Donna Hanscum, to round out the team and the women head off on the most important hunt of their lives.