Heather Chandler blackmails JD and Veronica into doing her bidding; Heather Duke and Heather McNamara struggle to adapt to life in the new regime led by Betty Finn.

Heather Chandler tries to double down on her suicide campaign only to have her brand tarnished; Betty Finn has some suspicions that link Veronica to an unsolved murder.

Veronica schools JD on how to be a proper boyfriend; Heather Duke and Heather Chandler spar over control of the hearts and minds of the Westerburg student body.

Prom brings all of the surviving characters together one last time. JD and Veronica attend separately and fight over some philosophical differences. Heather Chandler tries to make prom about her. Betty Finn returns.