‘Not a Stranger’ Release Date, Cast, Trailer, Plot and Everything Else You Need to Know About Netflix’s Creepy New Nanny Thriller

Netflix is about to give viewers a new reason to side eye anyone who offers to babysit. ‘Not a Stranger’ premieres on Netflix on September 17, 2026, telling the story of a mother, her career, and a new nanny whose secrets begin to disturb the family.

The Turkish psychological drama has already generated buzz thanks to a genuinely unsettling trailer, and with the release date now just days away, fans want to know everything about the cast, the premise and what kind of danger is waiting inside this family’s home.

‘Not a Stranger’ Release Date and Trailer Reveal the Show’s Eerie Tone

Netflix officially describes ‘Not a Stranger’ as the story of Funda, who is caught between motherhood and her art career and is relieved to get some help, only to find that her new nanny, shrouded in secrets, might not be all she seems. The streamer has released a full season trailer that runs just over a minute and a half, giving audiences their first real look at the show’s slow burn suspense.

The trailer opens on Funda as a loving, deeply attached mother of a newborn daughter who struggles to trust anyone else with her care. During a swimming session, the nanny asks who Funda would actually trust to watch her little princess, a moment that leaves Funda visibly hesitant even before anything has gone wrong.

Netflix has kept the nanny’s true identity and the extent of her secrets under wraps, and the setup leans more on domestic trust than on an open investigation. That ambiguity is intentional, and readers are being encouraged to treat trailer editing and social media theories as speculation rather than confirmed plot details ahead of the premiere.

The Cast Includes Elçin Sangu and Melis Sezen in Lead Roles

The series stars Elçin Sangu, Melis Sezen and Ozan Dolunay in the central roles, with Sangu playing Funda and Dolunay playing her husband İlker. Melis Sezen takes on the role of Nazlı, the nanny whose arrival throws the entire household off balance.

The supporting cast rounds out with Cemal Hünal, Efe Taşdelen, Murat Garipağaoğlu, Mine Teber, Nergis Öztürk, Arbil Tabur, Esra Şahin, and Ada and Arya Özdemir. That is a fairly sprawling ensemble for a show built around one family’s unraveling, which suggests the season may widen its scope beyond the core trio as the mystery develops.

Behind the camera, the series was directed by Mert Baykal and created and written by Tuğba Doğan, with Bombon Studios producing. Doğan’s fingerprints on both the writing and creation of the show point to a tightly controlled vision for how the suspense unfolds across the season.

The Plot Follows a Painter, a Newborn and a Nanny with Secrets

‘Not a Stranger’ follows Funda, a painter who takes a break from her work after having a child and later hires a nanny named Nazlı to help care for the baby. At first Nazlı seems like the answer to Funda’s problems, but her mysterious and unsettling behavior soon changes the life of Funda and her husband İlker.

What begins as a simple nanny arrangement slowly turns into a dangerous game involving trust, secrets, manipulation and family conflict. It is the kind of premise that leans into a very specific corner of psychological thriller storytelling, the domestic space turned unsafe by someone who was invited in.

The show blends psychological suspense with family drama, and its original title, Seni Tanıyorum, translates roughly to ‘I Know You,’ a phrase that takes on a much creepier meaning once the trailer’s twist starts to unfold. The clearest hook for viewers is watching Funda accept help from a nanny whose concealed past threatens to destabilize both her family and her career, with the official material establishing that direction without giving away how far the secrets actually go.

The ‘Not a Stranger’ Age Rating Signals a Darker, More Mature Watch

‘Not a Stranger’ carries a TV-MA rating, reflecting its psychological thriller content, mature relationship themes, sensuality, coarse language, smoking, drinking and domestic danger. The series is not considered suitable for kids given its mature themes, psychological manipulation, family conflict and situations involving danger to a child.

That rating tracks with what the trailer has already shown, a series more interested in slow, creeping dread than jump scares. For a show marketed around a baby’s safety and a stranger’s hidden motives, the mature classification makes sense given how uncomfortable the premise is by design.

The series is entirely in Turkish and produced in Turkey, joining Netflix’s growing slate of international psychological thrillers that have found global audiences well beyond their country of origin. With the trailer already stirring conversation online, ‘Not a Stranger’ looks positioned to be one of the platform’s more talked about international releases this fall.

With Funda’s trust in her new nanny hanging by a thread and the premiere just around the corner, would you let Nazlı anywhere near your family, or does her swimming pool warning already have you convinced something is very wrong here.