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.