‘Not a Stranger’ Release Date, Cast, Trailer, Plot and More About Netflix’s New Thriller

Netflix is set to give viewers a new reason to be cautious about babysitters. ‘Not a Stranger’ premieres on Netflix on September 17, 2026, and tells the story of a mother, her career, and a new nanny whose secrets begin to unsettle the family.

This Turkish psychological drama has already created buzz thanks to a genuinely unsettling trailer, and with the release date just days away, fans are eager to learn everything about the cast, the premise, and the dangers lurking within this family’s home.

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

Netflix describes ‘Not a Stranger’ as the tale of Funda, who finds herself torn between motherhood and her art career. She is relieved to get help, but soon discovers that her new nanny, cloaked in secrets, may not be who she appears to be. The streamer has released a full season trailer that runs just over a minute and a half, offering audiences a glimpse into the show’s slow-burn suspense.

The trailer opens with Funda as a devoted mother of a newborn daughter who struggles to trust anyone else with her care. During a swimming session, the nanny questions who Funda would actually trust to watch her little princess, a moment that visibly unsettles Funda even before anything goes awry.

Netflix has kept the nanny’s true identity and the extent of her secrets under wraps, focusing more on domestic trust than an overt investigation. This ambiguity is intentional, encouraging viewers to treat trailer edits 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 central roles, with Sangu portraying Funda and Dolunay as her husband İlker. Melis Sezen plays Nazlı, the nanny whose arrival disrupts the entire household.

The supporting cast includes Cemal Hünal, Efe Taşdelen, Murat Garipağaoğlu, Mine Teber, Nergis Öztürk, Arbil Tabur, Esra Şahin, and Ada and Arya Özdemir. This diverse ensemble suggests that the season may expand its focus beyond the core trio as the mystery unfolds.

Behind the scenes, the series was directed by Mert Baykal and created and written by Tuğba Doğan, with Bombon Studios producing. Doğan’s involvement in both writing and creation indicates a carefully crafted vision for how the suspense will develop throughout 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 assist with the baby. Initially, Nazlı appears to be the solution to Funda’s challenges, but her mysterious and unsettling behavior soon alters the lives of Funda and her husband İlker.

What begins as a simple nanny arrangement gradually evolves into a perilous game involving trust, secrets, manipulation, and family conflict. This premise delves into a specific niche of psychological thriller storytelling, where the domestic space becomes unsafe due to someone who was invited in.

The show merges 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 connotation as the trailer’s twist unfolds. The most compelling hook for viewers is watching Funda accept help from a nanny whose hidden past threatens to disrupt both her family and her career, with the official material hinting at this direction without revealing how deep the secrets truly run.

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 deemed unsuitable for children due to its mature themes, psychological manipulation, family conflict, and situations involving child endangerment.

This rating aligns with what the trailer has already indicated, showcasing a series more focused on slow, creeping dread than jump scares. For a show centered around a baby’s safety and a stranger’s hidden motives, the mature classification is fitting given how uncomfortable the premise is by design.

The series is entirely in Turkish and produced in Turkey, joining Netflix’s expanding lineup of international psychological thrillers that have captivated audiences far beyond their country of origin. With the trailer already sparking conversations online, ‘Not a Stranger’ seems poised to be one of the platform’s most discussed 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 allow Nazlı anywhere near your family, or does her swimming pool warning already convince you that something is very wrong?