In "Immortal in Death," the story unfolds in a futuristic New York City, where Lieutenant Eve Dallas is called to investigate a high-profile murder. The victim, a well-known model named Tandy Ellis, has been found dead in a luxurious apartment. The case quickly draws attention due to the victim's glamorous lifestyle and connections to the elite social scene. Eve's past experiences in dealing with crime help her navigate through a web of potential suspects and motives, highlighting the tensions between the rich and the less fortunate in this advanced society.
As Eve delves deeper into the investigation, she discovers that the case is linked to a sinister world of illegal activities involving a new line of designer drugs that promise eternal youth. This revelation not only complicates her investigation but also puts her in jeopardy as she faces threats from powerful figures desperate to protect their secrets. Alongside her partner, Peabody, and the ever-charming Roarke, Eve works tirelessly to unravel the mystery while confronting her own demons and insecurities.