Donna's niece Wendy goes missing near a truck stop, and she calls on the Winchesters for help. They soon discover that Wendy's abductor is part of an online business providing food to monsters.

After Castiel makes his way back to Sam and Dean, they set out to find Lucifer and gain an unexpected ally. Meanwhile, Lucifer finds a cooperative angel and makes Heaven's angels an offer that they can't refuse.