Julia Banks finds herself embroiled in a harrowing situation as she becomes the prime suspect in the murder of her dangerously obsessive ex-boyfriend, Michael. Despite her protests of innocence and claims that she has been framed, the evidence appears damning, especially the social media threads that indicate her infatuation with Michael.
The story unfolds six months prior when Julia is honored by her colleague and friend, Ali, during her farewell from her position as the chief online editor at a storytelling website. With hopes of a fresh start, she looks forward to working remotely from the mansion she will share with her fiancé, David Connover, and his daughter, Lily. Upon arrival at David's home, Julia faces complications including an unexpected encounter with David’s ex-wife, Tessa, who is still grappling with the separation from David that occurred two years earlier.
Soon after Julia moves in, Tessa's jealousy surfaces when she discovers Julia's restricted relationship with Michael has ended. One fateful evening, while Tessa is dropping something off at the house, her daughter Lily insists on having Tessa stay for dinner. The evening turns sour quickly as Tessa disparages Julia’s culinary skills before leaving, and Julia realizes her restraining order against Michael has lapsed, leaving her vulnerable.
Tessa, influenced by her overbearing mother “Lovey", seeks to disrupt Julia’s life by creating a fake Facebook account resembling Julia’s profile, tricking Michael into believing that Julia longs for him. Meanwhile, Tessa executes a crafty scheme that includes sending Julia flowers to incite distrust and manipulate David into thinking Julia is unfaithful. During a visit to a local farmer's market, chaos ensues when Tessa undermines Julia's efforts at parenting by asserting her authority over Lily.
The tension escalates as Julia confronts Tessa about her meddling in David’s life. Attempting to reconcile, they have a lunch together where Tessa makes shocking claims about David’s suspicions of her infidelity. As the web of deceit grows, Tessa cruelly punishes Lily, and in an alarming turn of events, she attempts to frame Julia for attempted murder after a staged fall down the stairs.
In a twisted climax, Tessa, portraying Julia, attempts to lure Michael to the house under false pretenses, resulting in a violent confrontation where Julia is forced to defend herself, ultimately leading to Michael’s brutal death. In the aftermath, Julia is interrogated by the police but is released as the investigation broadens. While initially supportive, David's faith in Julia wavers upon seeing the incriminating evidence against her, prompting him to confront Tessa.
As the story nears its conclusion, Tessa's cruelty culminates in a fateful encounter, where in a moment of clarity she recognizes her monstrous transformation and takes her own life, pleading with Julia to protect Lily's memory of her.
Fast forward six months, and Julia and David have united in marriage, moving into a new home with a sense of hope. However, that hope is shattered when Julia opens the door to find Lovey, framing a chilling scene as the past threatens to resurface.
