The 2025 TV series Sirens unfolds over a single weekend at a luxurious beach estate, focusing on the complex dynamics between two sisters, Devon and Simone, and Simone’s enigmatic employer, Michaela “Kiki” Kell.

The story begins with Devon, who is struggling with addiction and the responsibility of caring for their father Bruce, who has early-onset dementia. Devon receives a fruit basket from Simone, who works as a live-in assistant to Michaela, a wealthy socialite. Feeling frustrated and disconnected from her sister’s seemingly glamorous life, Devon decides to visit Simone at the coastal estate to confront her and demand accountability.

Upon arrival, Devon is struck by the pastel-dressed, detached atmosphere of the estate and suspects that Simone might be involved in something cult-like. Simone, meanwhile, is immersed in preparing for Michaela’s annual summer gala to raise money for a bird sanctuary. She appears addicted to the luxurious lifestyle Michaela provides, wearing bright colors and maintaining a polished facade, which contrasts sharply with Devon’s more troubled existence.

Tensions escalate when Ethan, a character connected to Simone, drunkenly falls off a cliff during an argument with Simone about their breakup. Ethan survives but suffers two broken legs. Meanwhile, a Vanity Fair photographer shows Michaela a photo of Peter, Michaela’s husband, kissing Simone. This revelation triggers a series of dramatic events.

Michaela, feeling betrayed, fires Simone abruptly, rescinding her offer to make Simone chair of her foundation and having her escorted off the property. The staff, who dislike Simone, pack up her luxury belongings for donation. Simone, panicked at the prospect of returning to her father’s care, escapes to the beach where she meets Peter. Peter, who has turned against Michaela after learning about Simone’s firing, enlists Jose to break into Michaela’s safe to destroy the incriminating photo of him and Simone.

Devon declines an invitation from Morgan to join a month-long yacht trip, choosing instead to return to Buffalo with Bruce. Jose escorts Simone, Devon, and Bruce to pick up Raymond from jail, where he had been sobering up. During this trip, Simone runs off to say goodbye to Peter, and Jose has to retrieve her.

At the gala dinner, Devon accuses Michaela of running a cult and being involved in the supposed death of Jocelyn, only to learn Jocelyn is alive but living in seclusion after a failed plastic surgery. Peter tells Michaela he wants a divorce, expressing his dissatisfaction with their childless marriage and his fear of Michaela’s collection of evidence on his affairs, which she uses to protect herself under their prenuptial agreement. Peter begins a relationship with Simone and asks Jose to escort Michaela out.

Devon confronts Simone about her involvement with Peter. Simone invites Devon to stay at the estate with Bruce, but Devon declines. On the ferry home, Devon runs into Michaela and apologizes for her earlier accusations. Michaela encourages Devon to cash a $10,000 check she had given her.

The series concludes with Simone becoming the new mistress of the estate, standing at the edge of the cliff overlooking the sea with a satisfied smile, symbolizing her ascension to power. Ethan survives his fall, Devon returns to Buffalo to care for their father, and Michaela is effectively ousted from her position of control.

The series explores themes of women, power, class, and identity. It delves into how the characters transform into inauthentic versions of themselves under pressure, the allure and dangers of wealth and control, and the complexities of sisterhood and loyalty.

Simone has an unsettling and cult-like relationship with her employer Michaela Kell, a controlling billionaire socialite. Michaela's luxurious and cultish lifestyle is addictive to Simone, who becomes increasingly entangled in it, causing alarm to her sister Devon.

Devon is troubled by Simone's involvement with Michaela and tries to intervene, but Simone is drawn deeper into Michaela's world. Their relationship becomes strained, especially after Simone makes her relationship with Peter public and seems to replace Michaela as the new Mrs. Kell, leaving Devon to face her challenges alone.

Peter is Michaela's husband who feels uninspired and resents their childlessness. He begins a relationship with Simone, proposes to her, and plans to divorce Michaela. His actions significantly impact the power dynamics among the characters, especially between Michaela, Simone, and Devon.

Over one explosive weekend, each of the three main women—Devon, Simone, and Michaela—are tested and forced to confront their lies and desires. Simone becomes the new Mrs. Kell, Michaela loses her control and status, and Devon struggles with her family and personal challenges, highlighting their shifting identities and survival strategies.

The 2025 TV series Sirens is not family friendly and contains several potentially objectionable or upsetting elements for children or sensitive viewers. These include:

• Graphic sex scenes and partial nudity
• Foul language
• Substance abuse, including alcoholism
• Depictions of infidelity
• An attempted murder/suicide involving a mother and her young daughter
• Emotional abuse and coercion themes
• Neurotic and disturbing behavior among characters
• Dark and unsettling themes around power, control, and toxic relationships

The series is a dark comedy thriller with intense psychological and social themes, making it unsuitable for children or those sensitive to mature and distressing content.