Of course, because this book was published in 2010, it was written at a time when there was no resolution on this case of this particularly obnoxious person. Drew Peterson, at the time of publication of this book, was riding high on the fact he appeared to have got away with murder (literally) at least once, and very likely twice and worse, was getting enormous amounts of publicity to feed his oversized ego (making up for what, one immediately wonders?).
Fortunately, a quick search on Wikipedia and I discovered that actually, this arsehole is now going to spend the rest of his pathetic life in gaol. The world will definitely be a nicer place without him. However, during the chapter where the author described the traits of a sociopath, it felt like he was describing a certain obnoxious egomaniac who for some reason can list the White House as one of his many luxury addresses...
This book fell down on the fact there was no real resolution to it, it was very repetitive and despite the thorough research by the author, even going so far as to interview all of the key players (who weren't dead or missing), it didn't seem to say a lot. Hindsight is a wonderful thing, but this book would have been far more successful if it had been written in 2016.