On an October evening in 1977, 2 girls were enjoying a night out in the World's End pub in central Edinburgh. The following day, one body was found on a beach, the other in a field.

The girls were seen leaving the pub with two men but the identity of the killer would remain a mystery for the next 30 years. In 2007, Angus Sinclair was charged with the girl's murder after new DNA evidence linked Sinclair and his brother in law Gordon to the murders. However the trial sensationally collapsed when a piece of crucial evidence was withdrawn. Unbeknownst to the jury, Hamilton had a history of sex attacks starting at the age of 16 and culminating him serving a life sentence for the murder of a 17 year old woman in Glasgow in 1978
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In 2014, following the development of new DNA technology, Prosecutors successfully applied for a change in a century's old law of double jeopardy, consequently allowing the same man to be tried twice for the same crime. This time, the trial proved successful and Sinclair was jailed for a minimum of 37 years. He has been described as Scotland's worst serial killer and the authorities believe he may well have been responsible for numerous other murders.

Estate agent, Suzy Lamplugh, disappeared in July 1986 after going to meet a client at a house in Fulham. Witnesses said they saw her arguing with a man near the address and then getting into a car. She has never been seen since. For almost thirty years police have followed many lines of enquiry – one being to identify who ‘Mr Kipper' is that she went to meet. So far they have reached a dead end. In 1994 she was officially declared dead, presumed murdered. The strongest theory to date is that convicted rapist and killer, John Cannan, killed Lamplugh. But as yet, this hasn't been proven.

Cannan is already serving a life sentence with the recommendation he never be released.