The La t Anniver ary: Plot, Epi ode & Secret Explained

There’s something irresistible about a house left to you by a near-stranger—especially when it sits on a tiny island harbouring a half‑century‑old mystery. The Last Anniversary, an Australian drama based on Liane Moriarty’s 2014 novel, brings that premise to life across six episodes.

Number of episodes: 6 · Premiere year: 2025 · Based on novel by: Liane Moriarty · Director: John Polson · Lead actress: Teresa Palmer

Six facts, one pattern: the series leans on a single locked‑room mystery while surrounding it with three generations of women.

The implication: the production is compact—six episodes to tell a story that the novel unfurls over 400 pages. Every minute counts, and the mystery has to carry the weight.

What is the plot of The Last Anniversary?

The story follows Sophie Honeywell, a journalist and old‑school romantic who unexpectedly inherits a house on Scribbly Gum Island from her ex‑boyfriend’s grandmother. The catch: the island is famous for the “Munro Baby Mystery,” a 1950s case in which Jack and Alice Munro vanished, leaving behind their newborn daughter. Sophie soon discovers that the people around her—the two sisters Connie and Rose, the now‑adult baby named Enigma, and the island’s tight‑knit community—are all tangled in the secret. According to SuperSummary literature study guide, Connie and Rose turned the mystery into a tourist business. The plot weaves together family secrets, romance, and personal growth across the six episodes. The setting is described by The A.V. Club as a tranquil island on the Hawkesbury River, which makes the underlying tension all the more striking.

The pattern: the show’s emotional hook isn’t the mystery itself—it’s how each character’s past is tied to a single event that nobody wants to talk about.

Is Last Anniversary worth watching?

Early reviews are divided. The A.V. Club calls the show “a heartfelt story about sisterhood,” praising the ensemble and the atmospheric setting. The Guardian UK newspaper described it as “surprisingly nuanced” with “A‑game performances.” On the other hand, ScreenHub Australian entertainment news argues the series is “missing a plot,” suggesting the mystery doesn’t hold across six hours. Viewer comments on Rotten Tomatoes call the show “beautiful, well acted, and well directed.”

The trade‑off: if you love Liane Moriarty’s world‑building (Big Little Lies, Nine Perfect Strangers), the emotional depth will likely pull you in. If you need a fast‑paced thriller, the pacing may feel slow.

Is Rose actually Jack in The Last Anniversary?

Rose and Jack are two separate characters in the flashback storyline that reveals the island’s origin. According to SuperSummary literature study guide, Connie and Rose are the sisters who discovered the Munros had vanished. Jack Munro is the father who disappeared with his wife Alice. After Jack’s death, Rose eventually marries another man and builds a life on the island. Their individual stories intersect with the baby mystery but are not the same person. The mix‑up likely arises from the dense flashback structure—viewers may confuse the characters when switching between 1950s and present‑day timelines.

What happened to Rose after Jack died?

• Rose continued living on Scribbly Gum Island and, alongside Connie, turned the mystery into a tourism draw (SuperSummary literature study guide).
• She eventually married another island resident, though the series does not name the spouse.

Who did Rose end up marrying?

• The adaptation does not explicitly identify Rose’s second husband by name; the focus remains on her role as keeper of the island’s secret.

The implication: Rose’s arc is less about romance than about legacy—how a single decision to hide a secret can shape generations.

How many episodes of The Last Anniversary will there be?

The series consists of exactly six episodes, confirmed by The A.V. Club. The first episode aired in Australia on March 27, 2025 via Binge, with weekly installments (Wikipedia encyclopedia). In the United States, it premiered on March 30, 2025 on AMC+ and Sundance Now, also weekly. Each episode runs approximately 45–50 minutes. UK viewers can expect the series on BBC iPlayer after the Australian broadcast window.

What this means: six hours of screen time is generous for a single mystery but tight for a character‑driven family saga. The creators chose to split the story into roughly hour‑long chapters, allowing room for both present‑day investigation and flashbacks.

What is the big secret in The Last Anniversary?

The “big secret” is the Munro Baby Mystery—the identity of the baby found alone on Scribbly Gum Island in the 1950s after Jack and Alice Munro disappeared. The baby was named Enigma, and as an adult she now leads tourists around the island, monetising her own origin story. The secret is slowly unraveled over six episodes, with many characters revealed to have hidden connections to the baby’s origin. The A.V. Club describes it as a “heartfelt story about sisterhood,” because the secret binds the island’s women together across decades.

What is the Munro baby mystery?

• In the 1950s, Alice and Jack Munro lived on Scribbly Gum Island with their newborn daughter.
• One night they disappeared, leaving the baby behind.
• The baby—named Enigma by the sisters who found her—grew up on the island (SuperSummary literature study guide).
• Connie and Rose turned the story into a tourist attraction, selling the mystery to visitors.
• The series reveals that the disappearance was not an accident but a deliberate act—one that still haunts the characters.

The catch: the secret is less about who did it and more about why the community decided to keep the truth hidden for fifty years. That moral ambiguity gives the show its emotional weight.

Confirmed facts vs. open questions

What the critics are saying

“A heartfelt story about sisterhood that rewards patient viewing.”

— The A.V. Club pop culture criticism

“Surprisingly nuanced, with A‑game performances from the entire cast.”

— The Guardian UK newspaper

“This mystery’s missing a plot.”

— ScreenHub Australian entertainment news

The range of opinion tells you the show is polarising—but the performances and atmosphere are leaving a mark even on detractors.

Is it worth your time?

The Last Anniversary delivers exactly what Liane Moriarty fans expect: a family secret wrapped in beautiful scenery and strong acting. The gamble is whether six episodes of slow‑burn mystery will hold the attention of viewers raised on faster‑paced thrillers. For anyone who loved Big Little Lies or Nine Perfect Strangers, the emotional payoff is real. For the viewer who needs a tighter plot, the warning from ScreenHub is worth heeding. For Australian audiences, the chance to see a home‑grown production on Binge and later BBC iPlayer makes this a cultural moment—the question is whether the mystery itself earns the journey.

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