A date night with Max turns into a male-bonding session when Tara inadvertently becomes "Buck;" Tara's sister Charmaine recommends her for a large mural project.
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.