In Obsession, Douglas is telling tales based on the accomplishment of others. He cites the Behavioral Science Unit's Ken Lanning on child molester matters and Robert Hazelwood on rape classifications. He cites Gavin deBecker's work on stalking giving superficial advise on topics he really does not understand himself, nor does he have any personal experience on these matters. It is obvious in his last two books that Douglas has run out of material and is now searching for topics to keep his books going. Douglas should quit the books while he is ahead of the game.