The gang goes on a psychedelic mushroom trip at Arthur's Desert Disco Oasis; tensions erupt when Margot decides to go off her meds; Noah and Dan's situationship with Adam turns romantic; Dan and Eliza bond over their shared realization.
The sudden death of Noah and Margot's estranged father brings the gang back to Texas, where Margot starts experiencing grief-induced psychosis; Noah discovers their mother Carolyn has been hiding a secret.
Noah spends Thanksgiving helping his mother Carolyn clean out her hoarder house; Eliza throws a tense dinner party with Margot and Dan to get content for her business.
After Carolyn moves in with them, Noah and Dan try to hide their relationship with Adam; Dan's parents come over on Christmas and pressure them to fast-track the adoption process; Margot reveals she's gone off her meds.
After a month off her meds, Margot experiences a manic episode; Eliza discovers that there may be a complication with her pregnancy; Noah and Dan discover Adam has been harboring a secret that may jeopardize the adoption process.
With Eliza's due date approaching, Margot checks out of the mental health facility unsure whether she has a home to return to; Noah and Dan must come to a decision about their separation; the gang must face what a baby means for their future.