Dexter's world is rocked when a rival serial murderer, dubbed the Ice Truck Killer by the media, privately contacts him and reveals that he knows Dexter's grisly secret. Meanwhile, Dexter's sister Debra is transferred to Homicide.
Dexter Morgan is a Miami Metro Police Department blood splatter analyst with a double life as a serial killer. While solving murders in the homicide division, Dexter also spends his time hunting and killing murderers and criminals who have escaped the justice system.