In Minnesota, a couple is found in an abandoned house frostbitten to death after hearing a crying baby inside. Mary insists they take the case, surprising Sam who worries she is burying her emotions. At the house Mary is grabbed by a ghost child but doesn't think he was trying to hurt her. Sam and Dean learn several children have died in that house and leave to burn the bones. Mary calls the last owner of that house and investigates it herself, the children's ghosts are still there. The father of the first girl who died, killed himself in the house and his ghost has been killing kids and keeping their spirits there ever since. He possesses Mary and attacks Dean, though Sam burns his bones; saving them and releasing the children's spirits. Mary admits she is mourning John and the little boys she used to have; leaving the bunker to be alone. Meanwhile Castiel reluctantly teams up with Crowley to find Lucifer who healed the legs of Vince's sister. Lucifer demands Rowena make his vessel stronger, she tricks him as her spell decays the body and sends him to the bottom of the ocean. She agrees to work with Castiel and Crowley the next time they corner Lucifer.
Source: Wikipedia
Source: Wikipedia
