Sissy is shaping up to be one of the more intriguing indie thrillers on the horizon. With Sofia Hasmik, Grace Kelly Quigley and Imogen Waterhouse now attached, the film brings together rising TV and film talent for a dark, one-night story set against the uneasy glamour of Los Angeles.
Writer-director Dejan Mrkic makes his feature debut with Sissy, an original sibling thriller that blends family drama, danger and Hollywood menace. For audiences who follow emerging genre films and prestige TV performers crossing into independent cinema, this casting announcement puts the project firmly on the watchlist.
Sissy cast brings together notable TV and indie film talent
The newly announced Sissy cast features three performers with strong momentum across television and film:
- Sofia Hasmik, known from Superman & Lois, has also recently appeared in The Pitt and Netflix comedy Tires.
- Grace Kelly Quigley earned attention for playing Maya Rubin opposite Rose Byrne in Apple TV+’s Physical, and is coming off the Sundance-winning feature Josephine.
- Imogen Waterhouse, currently appearing in The Buccaneers, previously led The Outpost and expanded her creative profile by directing episodes of the series.
That mix of experience matters. Sissy appears to rely heavily on performance tension, especially given its intimate premise and compressed timeline. Casting actors with both dramatic range and genre credibility suggests the filmmakers are aiming for emotional intensity rather than surface-level shock.
What Sissy is about
According to the film’s synopsis, Sissy unfolds over one relentless night. The story centers on Kim, played by Hasmik, an aging porn star who unexpectedly becomes responsible for her abandoned 11-year-old half-sister, Franki, played by Quigley. The pair are then forced to navigate a dangerous Los Angeles underworld tied to a notorious Hollywood horror producer.
The premise gives Sissy several built-in hooks:
- A fractured sibling relationship at the center of the story
- A race-against-time structure that can heighten suspense
- A Hollywood setting with a darker, predatory edge
- A female-led thriller dynamic that could blend vulnerability and resilience
Set across a single night, the film seems designed as a pressure cooker. That format often works well for thrillers because it strips away distractions and forces characters into immediate, high-stakes decisions. In this case, the emotional core may be just as important as the danger itself.
Dejan Mrkic makes his feature debut with Sissy
One of the most notable aspects of Sissy is that it marks the feature directorial debut of Dejan Mrkic, who also wrote the original script. Mrkic will co-produce the film alongside Javier Gonzalez, his producing partner.
For debut features, the producer pairing can be especially significant, and Gonzalez brings serious independent-film credibility. He recently won the Grand Jury Prize at Sundance for In the Summers, and his earlier producing work includes A24’s Funny Pages and IFC Midnight thriller Swallow. Those credits point to a producer comfortable with bold storytelling, distinctive tone and psychologically charged material.
If Sissy follows that same lane, viewers can likely expect a thriller that leans arthouse as much as commercial, using character and atmosphere to drive suspense.
Why this indie thriller stands out
At first glance, Hollywood-set thrillers are nothing new. But Sissy has several elements that make it stand out in a crowded field.
A character-first thriller setup
The relationship between Kim and Franki gives the film a built-in emotional engine. Rather than centering only on crime or violence, Sissy appears rooted in responsibility, abandonment and survival.
A sharp Los Angeles backdrop
Los Angeles remains one of cinema’s most effective thriller settings because it can feel glamorous and threatening at the same time. In Sissy, that contrast seems central to the story’s identity.
Strong below-the-line talent
The project also adds visual credibility through cinematographer Hayden Mason, whose recent work includes the Chloë Sevigny-produced documentary Summer Tour, which premiered at Telluride. That background suggests an eye for texture, mood and observational detail—qualities that could elevate Sissy beyond a conventional indie genre piece.
What the casting says about Sissy’s potential
The casting of Hasmik, Quigley and Waterhouse indicates that Sissy is targeting audiences who follow both prestige television and festival-driven independent film. Each actor arrives with a recognizable fan base, but none feels overexposed, which can be an advantage for a tense, immersive thriller.
Hasmik seems particularly well-positioned for a role like Kim, which likely requires grit, vulnerability and emotional complexity. Quigley’s casting is equally interesting, given her prior work balancing sharp, emotionally layered material. Waterhouse’s addition further broadens the project’s appeal, especially for viewers familiar with period drama and genre television.
In short, Sissy looks like the kind of film that could move from quiet casting announcement to buzzy festival title if the execution matches the premise.
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Final takeaway on Sissy
With a compelling cast, a tense one-night premise and credible indie talent behind the camera, Sissy already has the ingredients of a breakout thriller. Whether it lands as a festival favorite, a streaming discovery or a word-of-mouth genre success, Sissy is now firmly a title to watch in the TV and video space—and one that could surprise audiences with far more than a standard Hollywood thriller setup.
