Dexter Morgan, Miami PD blood-spatter analyst, is accustomed to seeing evil deeds - he occasionally enjoys committing them himself. Guided by his Dark Passenger - the voice that helps him stalk his prey - he lives his outwardly normal life according to one simple rule: he kills only very bad people. But everything changes when Dexter attends a gruesome double homicide. Dex realises he's dealing with someone a lot more sinister than he is, and…