An investigation into a murder that happened at a public school brings to light the intertwining relationships of a group of mothers and their families
Celeste tries to deal with Perry's violent outbursts. Madeline and Ed clash with Nathan and Bonnie over the proper parenting for Abigail. Jane struggles with her traumatic past.
The cold war continues between Renata and Madeline. Abigail decides to move out of her mother's house. When Ziggy's school project stirs up some uncomfortable questions, Jane reveals the truth about Ziggy's father to Madeline.
Celeste agonizes over how to inform Perry of her wish to return to work. Madeline and Jane try to confront a man whom they believe is Jane's rapist. Ziggy talks to a psychologist who deduces that he might be getting bullied.
Renata discovers that Amabella is still being hurt at school. Madeline's old affair with Joseph threatens to be exposed after a car crash. Jane takes a gun to see her rapist.
Things reach the boiling point between Celeste and Perry. Madeline accidentally reveals her past affair. Renata tries to figure out a way to discover who is hurting Amabella.
When Celeste discovers that her sons have started to copy their father's violent tendencies, she decides to cut ties with Perry once and for all, leading to an explosive confrontation that exposes a terrible connection to Jane.