Regina George has nothing on Linda Liddle. Rachel McAdams is a pure, unhinged delight as a brilliant but socially awkward business analyst and survivalist junkie, a woman whose instability is wielded with equal parts delicacy and blunt force. As we watch her fall apart, reassemble, and crack again, Dylan O’Brien and director Sam Raimi join her in delivering the kind of precarious, shifting-sand thriller that used to be the backbone of mid-budget cinema.

Where lesser performances might soften Linda’s edges—playing her awkwardness for laughs or sympathy—McAdams does something far riskier. She alienates the audience while simultaneously toying with our empathy. Her social discomfort is strategically misleading: the script hints that her fractures may have always been there, but McAdams keeps you guessing about how much is circumstance and how much is revelation. You’re never allowed to settle into rooting forher so much as bracing yourself with her. By the film’s end, you feel exhausted and used—but in exactly the way this kind of thriller should leave you.

O’Brien is the perfect counterweight. His character is rude, calculating, shallow, and never especially charming, yet just broken enough to earn a sliver of audience concern. He doesn’t feel dangerous because he’s unpredictable—he feels dangerous because he’s painfully honest about who he is. The film gains much of its tension by volleying honesty and trustworthiness back and forth between two deeply compromised people, neither of whom ever fully deserves allegiance.

Their contrast is initially clean: she begins the film uncomfortable in her own skin, unable to function in the world she occupies, while he moves through it with inherited ease and social fluency. Once stranded together, those dynamics invert. McAdams, barely a physical threat and pointedly stripped of any modern “girlboss” invincibility, is given a force multiplier instead—her obsessions, routines, and peculiar fixations become survival tools. O’Brien, injured and raised in total luxury, finds himself helpless without the systems that once insulated him. They learn to work together, begin to respect one another, and then—inevitably—betray each other, repeatedly. By the end, he may be the saner of the two, but sanity proves to be a thin shield in isolation.

Raimi orchestrates this descent with Machiavellian grace. His camera is far more restrained than in his earlier work, matured into something subtler and more patient, but his instincts remain unmistakable. He psychotically toys with audience allegiances, refusing to grant a stable moral foothold or sustained relief. Just when a scene threatens to release tension, Raimi introduces a note of wrongness—a pause, a look, a betrayal-in-waiting—that keeps the ground shifting beneath you. The film is cruel, playful, and amused by the audience in equal measure.

Send Help is not a particularly deep or intricate psychological thriller, and it has no interest in being one. There’s no grand thesis, no layered metaphor begging to be unpacked. Its simplicity is the point. By stripping the premise to its bones, Raimi leaves everything to timing, atmosphere, and two heavyweight performances willing to make themselves unpleasant. The result is a tight, focused thriller that doesn’t pander, doesn’t sermonize, and doesn’t confuse emptiness for depth.

In an era where big studios substitute spectacle for chemistry and smaller films substitute messaging for story, Send Helpis a reminder of what’s been lost: a mean little movie that trusts its audience to sit with discomfort, ambiguity, and fun. It won’t be for viewers who demand likable characters or moral clarity—but for anyone willing to be twisted into knots and left there, it works exquisitely well.