He was concerned how unaffected he was by this, fearing he lost part of his humanity, but revealed that investigating murders led him to regularly dream about murdering people himself. During my time on MITs, those dreams started to become more and more violent in nature. Most nights I would end up killing someone in my sleep. Stabbing, shooting, beating or strangling." It’s a bit of a cliché but when something bad happens, it really is the police that run to it when everyone else is running away and it actually makes me quite sad that the comments are people no longer trust the police. In the book, I look at it quite simply and it's not something we're taught as police officers. It's my theory on why people kill.

Luther is the worst programme I've seen in relation to murder investigations because you've got a DCI running around. So far this year, 28 teenagers have been killed as a result of violent crime in London and the city is in danger of equalling the record 29 young lives lost to violent crime in 2008.And 99.9 per cent of police officers are decent people whose whole existence is to look after people and they're the sort of people who would put their life on the line.

Mr Keogh doesn’t make any surprising revelations. For readers already familiar with the Whitechapel murders, the book’s main appeal is its application of modern investigative techniques to the crimes and the results of that application. Readers’ reactions to the results will, of course, depend upon their biases. He added: 'I will never get used to seeing dead children. That's the hardest thing I've ever had to deal with. I've probably seen 100 plus dead bodies and it's always the children I can remember.For former Met murder detective Keogh, who served on the force for 30 years, the biggest challenge it is facing is restoring the public's confidence in its ability to serve and protect. Blood, a lot of blood. It was in the kitchen and, most distressingly, in the children's bedroom. I can't think of anything worse than that scene,' Steve writes. There were two things that were really important for me - the first was the families. I don't refer to any names. I wanted to make sure that I wasn't seen to be exploiting them. It's been going on for generations. It will continue to go on and I don't know what the answer is.'

He believes that Martha Tabram, the second of the 11 murder victims was killed by the Ripper because she also had her throat cut, with post-mortem injuries, including to her vagina, in a similar way to Nichols, who also did not have body parts removed. Discussing how phone evidence can be crucial to an investigation, Steve shares details of a violent triple murder in December 2015. Mr Keogh said: "The Murder Academy has also taken off and I am now speaking about homicide investigations at conferences here and in the US.

He said: 'Most people get that TV shows are supposed to be entertainment - I don't think it's unhelpful [to what we do]. In 2005 he received a commendation from the then Commissioner of Police of the Metropolis, Sir Ian Blair, for his work in the aftermath of the London 7/7 Bombings. Part Four provides a high-level review of suspectology. Mr Keogh suggests criteria that might be used to eliminate suspects who were in fact innocent. He applies the criteria to ten popular suspects and considers eight of them eliminated. There's always been beef between gangs in Southwark and gangs in Lambeth and that's been going on for years. And all that's happened is the younger ones that are coming through are just continuing the same. It's a never-ending cycle.