Dexter in the Dark

This is the third book of the Dexter franchise released in 2007 and written by american author Jeff Lindsay. In this sequel, Dexter is about to marry Rita, her fiancé. Also, the Dark Passenger, who helps out Dexter in the cases of homicide, leaves him alone, when Dexter goes to a university and sees two headless charred bodieson campus. So Dexter has to nurture Rita's two kids and also find a powerful foe in the process.