Hey, r/books! Can anyone help me find a good non-fiction or fiction book about serial killers?

As the title says, I'm looking for a book about serial killers. I've read some books with (e.g. dexter) and I'd like some recommendations along those lines, preferably told from a first person perspective. I'm also looking for a book documenting the kills of a specific serial killer, or many of them.

TL;DR: Books like Dexter, non-fiction books about serial killers.