Jane, a single mother, is on her way to Pirriwee Public School in Sydney's Northern Beaches, where her son Ziggy is starting kindergarten. On the way, she meets Madeline, another mother with a daughter of the same age. Madeline's friend Celeste is also sending her twin sons, Max and Josh, to school. The two strike up a friendship with Jane. All three of them have their own problems: Madeline is resentful that her daughter from her previous marriage is growing close to her ex-husband's new wife, Bonnie; Celeste is physically abused by her rich banker husband, Perry; and Jane was raped and left to raise her son Ziggy on her own. To make matters worse for her, Ziggy is accused of bullying Amabella, his future classmate, during orientation.