Cecilia is a highly organized mother of three daughters living in a Sydney suburb. She prides herself on her efficiency and domestic management, excelling as both a Tupperware consultant and a school volunteer. Her orderly, predictable life faces sudden disruption when she discovers an old letter from her husband meant to be opened only in the event of his death.

Tess is an account executive at an advertising firm she built alongside her husband and her cousin in Melbourne. She secretly suffers from social anxiety, finding interactions draining despite her professional success. Following a devastating marital betrayal, she flees to her mother's home in Sydney, seeking distance and stability for her young son.

Rachel is the school secretary at St. Angela's and a grieving mother. Her life is permanently divided by the unsolved murder of her teenage daughter decades prior. She finds joy almost exclusively through her relationship with her young grandson while maintaining a polite but emotionally distant dynamic with her son and his wife.

John-Paul is Cecilia's husband and a devoted father to their three daughters. He actively participates in family activities, attending lengthy tea parties and listening patiently to his children. His recent withdrawal from physical intimacy and his panicked reaction to the discovery of an old letter raise concerning questions about his past.

Connor is the physical education teacher at St. Angela's school. He rides a motorcycle, wears a cheerful demeanor with his students, and is generally well-liked by the children. Decades ago, he was a police suspect in a local tragedy, a fact that still affects his reputation among certain community members.

Will is the creative director of a small advertising firm he runs with his wife and her cousin. He prompts a domestic crisis by announcing his sudden romantic attraction to his wife's closest relative. He attempts to manage the fallout with an earnest, apologetic approach that further frustrates his family.

Felicity is a graphic designer who operates an advertising business with her cousin Tess. After a lifetime of being overweight and feeling like a secondary character in Tess's life, she recently lost forty kilos. Her physical transformation coincides with a disruptive romantic attachment to her cousin's husband.

Janie is Rachel's deceased daughter who died in 1984. During her life, she was a popular, attractive teenager managing secret relationships under her strict father's rules. Her unsolved death continues to impact the lives of multiple families in the community.

Rob is Rachel's adult son who grew up in the shadow of his older sister's tragedy. He is an involved father who actively participates in childcare tasks. He maintains a polite but emotionally distant relationship with his grieving mother.

Lauren is Rob's wife and a successful career woman. She earns a higher income than her husband, which requires the family to relocate internationally. She attempts to bridge the emotional gap with her mother-in-law, though her efforts are often met with silent criticism.

Lucy is Tess's mother, residing in Sydney while recovering from a broken ankle. She is perceptive about family dynamics and immediately deduces the reason for her daughter's unexpected arrival, though she occasionally struggles to respect her adult daughter's parenting boundaries.

Liam is Tess and Will's six-year-old son. Confused by his parents' sudden separation and relocation, he seeks stability and easily connects with the friendly staff at his new school in Sydney.

Isabel is Cecilia and John-Paul's oldest daughter. Now in the sixth grade, she has aged out of some of the younger children's school traditions and begins to observe subtle, unexplained shifts in her father's behavior.

Esther is Cecilia's middle daughter. She has recently developed a strong intellectual fascination with the history of the Berlin Wall, frequently sharing historical facts with her family.

Polly is Cecilia's youngest daughter, a beautiful seven-year-old whom her mother frequently compares to Snow White. She develops a childhood crush on her physical education teacher and enthusiastically plans her pirate-themed birthday party.

Trudy is the principal of St. Angela's school. She is highly skilled at putting children at ease, though she occasionally neglects social niceties with adult parents. She attempts to manage the emotional complexities of her grieving secretary with varying degrees of success.

Mary is Lucy's twin sister and Felicity's mother. She attempts to act as a peacemaker during the sudden family conflict, tearfully defending her daughter's romance while mourning the potential loss of family closeness.