Carly Norris is a stressed book editor seeking a fresh start in Manhattan after a painful divorce. She moves into a sleek, ultra-modern high-rise on the Upper East Side known as a "sliver" building. The architecture is mesmerizing, but the building holds a dark, voyeuristic secret. Carly soon learns that the previous tenant fell from the exact same balcony to her death under suspicious circumstances, a tragedy that mirrors her own apartment’s layout.Despite the grim history, Carly is quickly drawn into the building’s glamorous social circle. She becomes romantically involved with Zeke Hawkins, the enigmatic, wealthy video game designer who owns the building. Zeke is controlling, intense, and harbors a bizarre obsession with the tenants. At the same time, she befriends Jack Landsford, a cynical, alcoholic true-crime writer living in the building who is obsessed with the previous tenant’s murder and convinced that a serial killer stalks the premises.As Carly and Zeke’s passionate affair deepens, the boundaries of privacy dissolve. Carly discovers a hidden network of monitors in Zeke’s subterranean control room. She is horrified to realize that Zeke has secretly wired every single apartment with surveillance cameras, allowing him to watch the intimate lives of all his tenants in real-time. Feeling violated and manipulated, Carly confronts Zeke, realizing that his charming exterior masks a deeply disturbed voyeur who uses surveillance to control and manipulate those around him.Meanwhile, the body count in the building begins to rise. Tenants linked to Zeke and Carly are murdered one by one, escalating the paranoia. Jack becomes increasingly unstable, convinced he knows the killer's identity, while Carly tries to untangle the web of lies. Suspicion shifts wildly between Zeke, whose surveillance equipment makes him the
prime suspect in both the murders and the ongoing harassment, and Jack, whose obsession with the building’s dark history borders on homicidal mania.The tension culminates in a violent confrontation on the building's roof. Jack is revealed to be the killer, driven by a twisted desire to create his own real-life crime stories and punish the voyeuristic environment Zeke created. During a brutal struggle, Jack attacks Carly, but Zeke intervenes to save her, nearly plunging to his death in the process. In
the aftermath, the shocking extent of the building's intrusion is laid bare. Carly, deeply traumatized by the violation of her trust and the horror she has witnessed, walks away from Zeke and the high-rise forever, determined to reclaim her independence and leave the suffocating world of surveillance behind.