As Jack and Joan prepare for her first southern hemisphere Christmas by the beach, a reef dive goes catastrophically wrong, and Joan does all she can to save an injured diver. With a young woman's life in the balance, Joan and Jack discover the accident is really a case of sabotage. The mystery hits home for Jack, who secretly seeks out a woman from his past to make amends for his mistakes.

Rebecca's sudden arrival throws Joan into turmoil as she struggles with how to tell her daughter about the murder charges against Ian. Tracing Ian's last movements is put on hold when a neurodivergent Indigenous boy goes missing and the search becomes a potential abduction investigation. Rebecca is determined to bring her mother back to London and begins to question Joan's well-being.

After a vehicular collision with the enigmatic Jack, Joan's first stop in her (covert and novice) investigation into her husband's betrayal brings them to a waterside paradise where a group of old friends have gathered. Then a tragic death puts a stop to the party. Was it an accidental drowning, or is this idyllic land so intensely beautiful, it's worth killing for?

At a remote, mountaintop campground, and after a devastating revelation about Ian's past, Jack and Joan take a moment to unwind with a friendly bunch of fellow tourists. When a high-end caravan is stolen, everyone becomes a suspect and, it turns out, everyone has something to hide. Joan's frustration with Jack puts her life in danger after the thieves return to steal her motorhome.

In a small outback town on New Year’s Eve, Joan’s search for answers about Ian is waylaid when the motorhome runs out of fuel. Taking jobs as waiters, Jack and Joan are drawn into the illegal tobacco trade.

Jack takes a detour to a banana plantation to help his longtime friend and former brother-in-law, Declan, recover a cache of stolen guns. It soon becomes clear that there is more to the gun theft than first appeared, and unraveling the mystery leads to some surprising emotional truths. As Joan begins to get the hang of investigating, she turns her newfound talent to learning more about Jack.

Jack reconnects with Elyse, the daughter of Rosemary, the bride Jack left at the altar. A surf lifesaving champion, Elyse believes someone tampered with a drug test, causing her to be banned from her sport just before the national championships.

Max reveals that she's engaged to a man she just met, but when he collapses during a night of drinks, Jack and Joan suspect that someone tried to poison him.

The search for answers about Jack's past leads him and Joan into the path of two warring brothers whose fight over the family farm escalates when one of the brothers is injured in a suspicious fall.

Joan's estranged sister, Max, invites her and Jack to an island resort, but when a guest is kidnapped, the sisters must work together to find him.

Jack and Joan's stay at a winery is interrupted when a fire breaks out and nearly kills an employee; at first, it looks like an act of sabotage by one of the feuding owners, but then another near-fatal incident occurs.

In a small surfing town, Jack and Joan come to the aid of a victim of a hit-and-run, local nurse Gillian. When they learn she has been implicated in a series of suspicious deaths at the hospital, they realize many people may have wanted her dead.

After receiving a mysterious clue to the location of the gun that can clear Jack's name, he and Joan race to its remote hiding spot. But they are hotly pursued, and Jack and Liz suspect someone close to home is behind everything.

When Jack is struck by a hit-and-run driver, it sparks some unexpected truths and the return of a threat from Jack's past. As Jack recovers, he and Joan track down Ian's long-lost son, who holds the keys to the mystery. But is she ready to put the past to rest? And will the new threat facing Jack see the end of this journey together?