Dexter struggles with guilt over the recent death of his wife Rita so he seeks solace in his old killer ways and embarks on an unexpected relationship with Lumen.

Serial killer Dexter Morgan, who limits his victims to others killers, discovers that he was seen while committing a murder and is now being followed and mimicked, while at the same time a cop killer is targeting Miami's police detectives and leaving behind battered and bloodless corpses.

Carl Marsalis, a genetically engineered soldier who was created by the United States military, escapes his exile on Mars and travels to Miami, where he intends on retiring, but instead is arrested and given the opportunity to avoid a jail sentence if he tracks down a serial killer fugitive, who was also created by the government.