A tornado forces the Gregsons to take shelter in their basement, where Tara's new alter Shoshana takes charge and reveals some long-buried secrets during a group therapy session.
Tara signs up for a course in Abnormal Psychology, taught by a professor who begins to unravel the truth about her condition; Max sells the family business; Marshall becomes a filmmaker; Kate finds true love in the skies.
Family secrets are revealed thanks to a natural disaster and Tara's new alter "Shoshana;" Max tries to renovate and flip a house he inherited; Marshall tries dating a girl; Charmaine gets engaged but hides something from her fiance.
Tara makes the risky choice of going off her medication in an effort to uncover the truth about her condition's source, but her multiple personalities make her journey tumultuous and a challenge for her family.