My Life Among the Serial Killers: Inside the Minds of the World's Most Notorious Murderers

A book by Helen Morrison, a forensic psychiatrist.
She has interviewed and studied serial killers since the 70's, and with the families permission, actually owns a jar with John Wayne Gacy's brain in it.
What I got from this book is that she believes serial killers are made by society or abusive parent, they are born that way, with a genetic disposition, and that someday we will be able to identify them at birth. It is an interesting read.