In a world fractured by digital isolation, "split screen" follows two strangers, a reclusive tech designer and a struggling actress, whose lives become eerily intertwined through a mysterious glitch in their shared streaming service. When Emma Stone’s character, a perfectionist coder named Mia, begins to see fragments of another person’s reality superimposed on her own computer monitor, she discovers that John Boyega’s character, a hopeful performer named Leo, is experiencing the same phenomenon. As their separate screens merge into a single, disjointed narrative, they realize the glitch is not a random error but a deliberate puzzle left behind by a missing software genius. Forced to collaborate across time zones and conflicting schedules, Mia and Leo must decipher the digital breadcrumbs before a corporate rival, who will stop at nothing to bury the secret, can sever their connection. Blending psychological tension with a slow-burn mystery, this tech-noir thriller explores the fragile boundaries between connection and surveillance, leaving viewers questioning what lies just beyond their own screens.