Cortex: A Security Guard's Descent into Madness Hagen, a security guard plagued by irregular sleep patterns, finds his reality blurred by nightmares that seem all too real. When his wife Karoline cheats on him with Niko, a small-time criminal, a series of disturbing events unfolds. Hagen's paranoia heightens as he becomes obsessed with Niko, believing him to be the source of his torment. As the lines between dream and reality blur, Hagen's grip on sanity begins to slip. The two men's lives intertwine in a downward spiral of obsession, deceit, and violence. Will they escape the darkness that threatens to consume them, or will their fateful encounter prove fatal?

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Some movies that have similar genres and were produced around the same time as Cortex include Killers of the Flower Moon, The Little Things, Anatomy of a Fall, Secret in Their Eyes, Holy Spider, Sicario: Day of the Soldado.