Four years after the passing of his wife Becca due to cancer, businessman Karsh has created a groundbreaking innovation known as "GraveTech." This unique tombstone broadcasts a live, interactive 3D image of a deceased individual’s decaying body, allowing mourners to connect with their loved ones in an unprecedented way. The technology utilizes a modified shroud, and Karsh has plans to be buried alongside Becca. Despite his inability to find new love, he shares a strong bond with Becca's identical sister, Terry. However, each night, Karsh dreams of Becca returning, his visions becoming increasingly disturbing as they depict her in a weakened and mutilated state after her treatment by her ex-boyfriend, Dr. Jerry Eckler.
In a shocking turn of events, several tombstones in the GraveTech cemetery—Becca's included—are vandalized and the technology’s network is hacked, rendering the shrouds non-functional. Maury, Terry's ex-husband and the original coder of GraveTech's security, investigates the breach and discovers that the hacking originated from Iceland, one of the markets Karsh aims to target for expansion. During his examination of Becca’s remains, Maury identifies unusual protrusions on her bones, which Karsh attributes to her battle with cancer.
Meanwhile, Karsh encounters Soo-Min, the blind spouse of a CEO interested in sponsoring a GraveTech installation in Budapest, leading to a romantic entanglement. As Karsh's relationship with Terry intensifies, they share more than just friendly conversations about his exploits with Soo-Min, igniting a complicated and passionate connection between them.
As the investigation into the hack deepens, Maury’s findings reveal that the destruction of the tombstones was more intricate than first believed. Soo-Min cautions Karsh about the instability of the AI program, Hunny, which is modeled after Becca and starts to project a disturbing version of her, taunting Karsh regarding his inadequacies compared to Eckler. The tumultuous dynamics escalate when Terry secretly captures a video of Maury, showcasing his jealousy and revealing that his old version of schizophrenia has resurfaced, indicating he may have a role in the chaos surrounding GraveTech.
During a tense meeting in the woods, Maury unveils the grim remnants of his hand, having suffered a gruesome injury after hiring Russian hackers to infiltrate GraveTech's systems. This act was a desperate maneuver to gain favor with a group linked to the Chinese Communist Party, leading him to be tortured for details on their operations. The layers of deceit further complicate the narrative when a doctor examines Becca's remains, revealing that the protrusions are artificial rather than the result of her illness.
The dramatic climax unfolds as Karsh shockingly discovers Eckler's murdered body buried next to Becca. Terry speculates on how Eckler ended up there, and in a moment of dark humor, when Karsh jokes about having hired a hitman, it strangely excites her. Convinced that Becca now has someone to accompany her in the afterlife, Karsh decides to relinquish his burial spot, embarking on a jet with Soo-Min to Budapest. As they share an intimate kiss, Karsh is startled to see Soo-Min morph into an eerie reflection of Becca, complete with her scars, offering to share eternity with him in a twisted fate he unwittingly embraces.
