Home and Away is about to unleash one of its darkest and most shocking storylines in years, as a horrifying secret comes to light that ties two grieving families together

in the most disturbing way imaginable. In an explosive twist set to rock Summer Bay, it is revealed that Harper’s long-estranged mother is romantically involved with

the man responsible for killing Lacey’s mother — and she may be planning cold, calculated revenge. The revelation sends shockwaves through the Bay, re-opening old wounds

and igniting a chain of events that could destroy multiple lives. According to insider spoilers, Harper’s mother returns to Summer Bay under the guise of reconciliation, presenting herself as a woman seeking peace after years of absence. But behind the calm exterior lies a dangerous truth: she has been living under an assumed identity and is secretly involved with the convicted killer whose actions tore Lacey’s family apart years ago.

What makes the twist even more chilling is the motivation behind the relationship. Sources suggest this is no love story — it’s a long-game revenge plot.

“Harper’s mother didn’t stumble into this relationship,” an insider reveals. “She sought him out. She got close to him deliberately. And now that she’s back in Summer Bay, her endgame is finally in motion.”

For Lacey, who is still emotionally fractured by her mother’s murder, the truth hits like a second death. Upcoming episodes show her struggling to breathe as she learns that the woman standing across from her — smiling, apologising, offering comfort — has been sharing a bed with the man who destroyed her family.

The emotional fallout is devastating.

Lacey spirals, questioning every interaction, every kindness, and every moment she has spent trying to heal. Viewers will see her rage boil over in raw, confronting scenes that push her to the brink. “This isn’t just betrayal,” one script source explains. “It’s psychological torture.”

Meanwhile, Harper is blindsided by the truth about her own mother. Already fragile from recent trauma, she is forced to confront the possibility that the woman who gave her life is capable of manipulation, obsession, and violence. The bond between Harper and Lacey — once tentative but growing — is pushed to breaking point.

But the most terrifying element of the storyline is what comes next.

As clues begin to surface, it becomes clear that Harper’s mother is no longer satisfied with emotional revenge. She wants justice on her own terms. Whether that means exposing secrets, framing her lover, or orchestrating a final confrontation, insiders tease that the situation is “volatile, dangerous, and completely unpredictable.”

Is she trying to destroy the killer from the inside — or is she losing control of her own plan?

Fans are already reacting with disbelief and dread. Early buzz describes the storyline as “chilling,” “brutal,” and “true crime–level dark.” Many are calling it one of the most ambitious arcs Home and Away has tackled in recent years.