It's now 6 months since Captain LaGuerta's death. Dexter is still working as a blood spatter expert but Deb has quit the force and is now working as a private investigator. She's also been avoiding Dexter as much as possible. Angel Batista is now the squad's Lieutenant and Tom Matthews is a Deputy Chief. Dexter is worried about Deb in general but even more so after he hears she hasn't been in touch with her new boss for two weeks. Metro homicide has a new case after a body is found on the beach. The man's skull has been sliced open and a small part of his brain ...