Netflix’s Behind Her Eyes, the 2021 six-part psychological thriller that left viewers screaming at their screens and questioning everything, continues to haunt binge-watchers even four years after release. Adapted from Sarah Pinborough’s bestselling novel of the same name, the series has quietly climbed back into the global Top 10 this month with 18 million hours viewed in the past week alone, proving that some stories are too addictive – and too disturbing – to fade.

The plot begins innocently enough: single mother Louise (Simona Brown, in a breakout role) meets the charming psychiatrist David (Tom Riley) at a bar. Sparks fly. The next day she discovers David is her new boss – and he’s married to the elegant, fragile Adele (Eve Hewson). What starts as a forbidden office romance quickly spirals into something far darker: obsession, gaslighting, and a supernatural twist so jaw-dropping that Netflix reportedly received thousands of “WTF” messages the night Episode 6 aired.

The genius of Behind Her Eyes lies in its slow-burn deception. For five episodes, it plays like a classic erotic thriller: Louise is drawn deeper into David and Adele’s seemingly perfect marriage, uncovering layers of control, jealousy, and hidden pain. Adele, housebound and haunted by nightmares, befriends Louise in secret, sharing disturbing stories of her past. The chemistry between the three leads is electric – Brown’s quiet vulnerability, Riley’s polished menace, and Hewson’s brittle fragility create a triangle that feels suffocatingly real.

Then Episode 6 arrives.

Without spoiling the infamous ending (though many viewers still scream “body swap?!” in disbelief years later), the final twist redefines everything that came before. It’s the kind of reveal that makes you want to rewatch the entire series immediately, spotting clues you completely missed. The ending divided audiences: some called it brilliant and bold, others felt betrayed. Netflix even had to issue a “spoiler warning” on social media the week it dropped.

Critics were split but impressed. The Guardian gave it four stars: “A slow-burn that explodes into something truly audacious.” Variety praised Brown’s “magnetic” performance, calling her “the heart and soul of the show.” On Rotten Tomatoes, it holds an 82% critics score and 75% audience score, with the most common viewer comment: “I hated the ending… but I can’t stop thinking about it.”

The series’ power comes from its refusal to play by genre rules. It lures you in with steamy romance and domestic suspense, then pulls the rug out with supernatural horror and metaphysical questions about identity, control, and the nature of love. “It’s a story about who gets to tell the story,” showrunner Steve Lightfoot told Deadline in 2021. “And what happens when that power shifts.”

Years later, Behind Her Eyes remains a cultural touchstone. TikTok is flooded with reaction videos to the finale, Reddit threads dissect every clue, and book clubs still argue over the twist. For a six-episode limited series, its staying power is remarkable.

If you haven’t seen it yet, be warned: one episode leads to four, four leads to six, and six leads to sleepless nights wondering who – or what – was really in control.

Stream Behind Her Eyes now on Netflix. Just don’t say we didn’t warn you.