Dexter by Jeff Lindsay series

Dexter! New Hannibal Lecter, but in a sheep's clothing. A serial killer, whose creed is not a cause for sympathy!
A noble gentleman, old fashioned in relationships with women, he only kills "bad guys" and justice triumphs cause of him.
At least so he thinks, but later another serial killer appear's in the city, exactly copying his own "handwriting"
In the other part Dexter Morgan is under strong pressure. It is not easy To be ethical serial killer, especially when Sergeant Doakes is trying to avoid suspicion . Dexter had to hide behind a mask and tried to throw Doakes off his trail. Dexter spends most of his time with Rita and her two children before he starts to work as a specialist in blood-spatter analysis in Miami police. So he is slowly becoming a couch potato sipping light beer. But how much is enough for Dexter? How soon he will start to kill again?
In the Dexter without the demon he is accustomed to see the crimes working as a specialist in blood spatter for Miami police, especially because he usually makes them himself. Listening to his inner voice "the dark passenger": he only kills bad guys. But Dexter's happy existence ends when he comes to a crime scene to a campus. Dexter's Dark Passenger immediately feels something familiar, something very oppressive, and hides.
Dexter is alone for the first time, and he realizes that he will hunt for a truly evil opponent. For those trying he learn's how to be a stepfather of two children of his bride - children who can also have their dark half and also he plans the wedding that time.
In the next book Dexter tries to enjoy the family life, raises his foster children and work's as a specialist in blood spatter for Miami police. Dexter's sister Sergeant Deborah Miami was nearly killed by a new monster, guting his victims and turning them into chilling objects of a body art. Dexter begins his own investigation while Deborah is in a coma. But he makes a tragic mistake and compromises the safety of his family and his own freedom and life in the beginning, which show's him the other side.