Dexter is a forensic blood spatter expert for the Miami Metro Police Department. Based on a code given to him by his foster father, Harry, he survives ethically as a serial killer. He utilizes his expertise, often withholding evidence from the police so he can solve murders and kill the killers either before they kill again, or before they are caught by the police.
Micheal C Hall has said that he wanted to leave a story he thought was worth telling, it was one of the reasons he revisited the Series.
Dexter: New Blood, has left a number of plot openings for the show to continue, according to **sources.**
The Season 9 Series Finale, may just be a precursor to the show's tenth season. Speculation is what most of the shows require to get a reboot anyway, so anything is possible. Dexter Season 9 has been a great addition to the franchise, it left both critics and fans craven for more. According to studio speculation and forums would be strange not to see a tenth season after all.