When Stewie refuses to sleep in his own bed because of nightmares, Peter can't stand it, so he goes to sleep in the attic. Peter turns the attic into a man cave and all of the guys begin hanging out there, which makes Lois incredibly angry. Meanwhile, Brian helps Stewie overcome his fears by building a device to go into his nightmares and defeat his demons.

To pay for Stewie's private school, Lois becomes a postal worker. She finds a letter from Peter that was never sent to his old fling, Gretchen (guest voice Kathryn Hahn), dated a week before their marriage. When Gretchen tries to come between Lois and Peter, Lois has a plan of her own.