The film begins with Leah (Sanaa Lathan) as she prepares for work while her boyfriend, Dave (Morris Chestnut), remains in bed. In an affectionate moment, she kisses him good-bye, while he urges her to stay, but Leah is already late for her job. She brings up an upcoming party they will attend later that night, setting the stage for their relationship dynamics.
While at a coffee shop, Leah orders her iced coffee and notices a charming man at the counter. After a brief, flirty exchange, she inadvertently leaves with his drink. At the party that evening, Leah observes the rapport between Dave and a friend's young son, which raises eyebrows. Their conversation turns serious when Leah expresses her desire for marriage and children, but Dave is not ready to commit, leading to a heated argument and their eventual breakup.
Determined to channel her energy elsewhere, Leah immerses herself in her work life. One evening, while waiting for her friend Karen for dinner, she is approached by a persistent man. As Leah navigates this uncomfortable situation, the handsome stranger from the coffee shop, Carter Duncan (Michael Ealy), rescues her. The two realize their chemistry, ultimately leading to their first kiss and an exchange of contact information.
Carter quickly takes the lead, inviting Leah to meet again, where their connection deepens, culminating in a passionate night together. Leah is drawn to Carter’s charming nature, leading her to introduce him to her family in San Francisco. Although there is a positive bonding experience with her father, Leah’s mother insists they sleep in separate rooms, to which Leah tries to sneak into Carter’s bed, illustrating the complexity of their budding romance.
Just as things seem to move smoothly in Leah’s life, an unexpected moment at a gas station leads to Carter's violent side surfacing when he misinterprets a man's compliment to Leah as flirtation. The confrontation leaves Leah shaken and unsure about the relationship. After some time, Leah decides it's best to end things with Carter, leading him to spiral into obsessive behavior.
Carter begins stalking Leah, invading her personal space and causing distress. Despite Leah's attempts to move on, including reconnecting with Dave, Carter's disturbing actions escalate. His possessiveness manifests in frightening ways, including the murder of her neighbor, Mrs. McCarthy (Tess Harper), which profoundly impacts Leah and sends her life into disarray.
As Leah grapples with the loss of her neighbor and Dave's tragic fate, her sense of security erodes. Detective Hansen (Holt McCallany) tries to support Leah with legal action against Carter, but complications arise due to Carter's cunning and manipulative character. In a thrilling climax, Leah confronts Carter in her home, leading to a brutal physical confrontation.
The film crescendos as Leah takes matters into her own hands in a desperate fight for survival, ultimately culminating in her shooting Carter in a moment of self-defense. The aftermath sees Leah stepping into the police station to report the harrowing ordeal she endured.
Throughout this intense drama, the underlying themes of trust, obsession, and the struggle for autonomy resonate, reflecting the precarious nature of love and the darkness that can sometimes accompany it.