When the Winchesters learn of demons killing witches, they approach one and have her find them Rowena so that they can have her cure Castiel. Meanwhile, Crowley raises the young Amara in Hell but soon discovers that the Darkness may be beyond his control.

Sam and Dean track down a double axe-murder at Lizzie Borden's home, and soon realize that something supernatural is involved. As they continue their investigation, they soon discover that Amara is responsible for creating an army of soulless killers.