By the summer of 1979, Peter Sutcliffe had already killed ten women, but the investigation into his brutal crimes was about to take a fateful wrong turn, as police went public with letters and a tape sent by a man claiming to be the Yorkshire Ripper. Award-winning Daily Mail crime writer Stephen Wright speaks to retired Detective Chief Superintendent Chris Gregg, who joined the Ripper investigation as a young policeman, and who had serious doubts about the credibility of the so-called 'Wearside Jack' tape.

<p>By the summer of 1979, Peter Sutcliffe had already killed ten women, but the investigation into his brutal crimes was about to take a fateful wrong turn, as police went public with letters and a tape sent by a man claiming to be the Yorkshire Ripper. Award-winning Daily Mail crime writer Stephen Wright speaks to retired Detective Chief Superintendent Chris Gregg, who joined the Ripper investigation as a young policeman, and who had serious doubts about the credibility of the so-called 'Wearside Jack' tape.</p>

Award-winning Daily Mail crime writer Stephen Wright talks to top detectives, lawyers, victims and relatives to take an in-depth look at crimes that have shocked Britain (and the world), as well as revisiting some of his landmark stories and campaigns. From serial murderers to child killers, ruthless gangsters to corrupt police, psychopaths to paedophiles, celebrity criminals to audacious conmen, he untangles the mysteries and the secrets behind the headlines.

<p>Award-winning Daily Mail crime writer Stephen Wright talks to top detectives, lawyers, victims and relatives to take an in-depth look at crimes that have shocked Britain (and the world), as well as revisiting some of his landmark stories and campaigns. From serial murderers to child killers, ruthless gangsters to corrupt police, psychopaths to paedophiles, celebrity criminals to audacious conmen, he untangles the mysteries and the secrets behind the headlines.</p>

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