A secret assassin working as a blood spatter analyst for the Miami Police Department, Dexter Morgan finds his efforts to seek domestic tranquility undermined by a psychopath terrorizing the city.

Dexter, a forensic expert for the Miami Police Department, kills people in his spare time. However, he sees his killing as a benefit to society, because he only murders other killers that escape justice. After a relaxing honeymoon in Paris, a sense of normalcy has returned to Dexter's life. However, the discovery of a corpse reveals that there is a new serial killer in town, prompting Dexter to embark on another murderous escapade.

Dexter Morgan is not your average serial killer. He enjoys his day job as a blood spatter analyst for the Miami Police Department, but he lives for his nighttime hobby of hunting other killers. Dexter is therefore not pleased to discover that someone is shadowing him, observing him, and copying his methods. Dexter is not one to tolerate displeasure; in fact, he has a knack for extricating himself from trouble in his own pleasurable way.