Split

The day starts with Claire's birthday party, where friends are gathered to celebrate. Tensions arise as Casey is unenthusiastically invited, setting an awkward tone for the festivities.

During the party, Claire recounts Casey's struggles at school to her father, revealing the difficulties in their friendship. Their interactions suggest a sense of obligation rather than true camaraderie.

As Claire and Casey prepare to leave, Kevin unexpectedly intrudes into their car. His sudden appearance twists the narrative, thrusting the girls into a perilous situation.

Kevin renders Claire and Casey unconscious, awakening them trapped in a stark room alongside Marcia. Their disorientation quickly transforms into a shared panic as they realize the severity of their predicament.

Within their confinement, Marcia's pleas for help exemplify the girls' distress. While Claire insists on unity, Casey remains eerily composed, urging a strategic approach to their escape.

In a narrative flashback, Casey recalls her childhood, learning survival skills from her father and Uncle John. This contrasting memory provides insight into Casey's resilient spirit amidst the turmoil.

Dr. Karen Fletcher, intrigued by the severity of the girls' disappearance, begins to uncover the complexities of Kevin's disordered psyche. Her investigations delve deeper, particularly focusing on an email from one of Kevin's personalities, Barry.

The girls meet Patricia, one of Kevin's personalities, who initially seems benevolent. Her presence, however, carries a hidden danger as she outlines terrifying rules they must follow.

During a video call, Dr. Karen highlights the intricacies of dissociative identity disorder. She discusses Kevin's multiple identities and how they coexist, shedding light on the fractured nature of his mental state.

Another persona, Hedwig, emerges, showcasing a childlike demeanor. Casey attempts to manipulate Hedwig's innocence to gather information and seek a way to escape their dire situation.

Just when Claire finds a potential escape route, Kevin’s aggressive persona, Dennis, intervenes. This moment encapsulates the tension between desire for freedom and the suffocating reality of their captivity.

Dr. Karen and her assistant meticulously review surveillance footage revealing hints of Kevin's manipulative tendencies. The footage provides critical insights into the threats looming over the girls' ability to escape.

As the situation escalates, Casey is faced with The Beast, a monstrous manifestation of Kevin's internal struggles. This confrontation symbolizes the culmination of Kevin's fractured identities and poses the greatest threat to the girls.

In a harrowing moment, Casey confronts the grotesque reality of Claire and Marcia's potential fates. This awakening heightens the stakes as she navigates her precarious position in the dreadful game of survival.

In the gripping finale, Casey invokes Kevin's true identity, revealing the complexities of their intertwined destinies. The chaotic struggle against The Beast culminates in her fraught negotiation for survival, leaving lasting scars on her existence.