This book is interesting for its behind the scenes view of some of the most notorious crimes committed in the UK recent times. In fact it is more interesting on those crimes that have been eclipsed by the truly horrific murders we probably all feel we know too much about. I'd forgotten about the Heinz blackmail and the kidnap of baby Abbie, for instance. However, what is truly fascinating is the story behind the grossly prejudiced investigation of Colin Stagg in connection with the Rachel Nickell murder. That experienced policemen, lawyers and a psychologist could convince themselves that this wasn't entrapment of the most obvious kind is extraordinary. The author's portrayal of his role in this is defensive and disingenuous. I find it surprising that though this account goes into great detail about the Nickell murder and the separate investigation into the other crimes of Robert Napper (Britton was involved in both investigations) there is no postscript or footnote to explain that Napper was later convicted of the killing of Rachel Nickell. Would it be so difficult for the publishers to add a footnote into the ebook version? Otherwise, it is a very flawed book. Britton's attempt to show himself in heroic light, involved intimately in all aspects of the various police investigations is irritating. The book provides ample evidence for a reader to make up his or her own mind how useful psychological profiling in criminal investigations really is.