The police believed Sutcliffe was operating only in the Greater Manchester Police, South Yorkshire Police and West Yorkshire Metropolitan Police force areas, using his car. In fact, Sutcliffe was operating nationally and internationally, using his employer's lorry to commit attacks. Authors Chris Clark and Tim Hicks have meticulously researched Sutcliffe's crimes and reveal many of his previously unknown victims for the first time. The police failed to deliver justice for the victims' families, and the media has failed to hold the police to account for this failure – both in the original investigation and in subsequent cold-case investigations. The authors hope that by bringing more of the facts of the case into the public domain and by telling the victims' stories, they can help to bring closure for friends and relatives of victims of the Yorkshire Ripper. AUTHORS: Chris Clark is a retired police intelligence officer. He is the author of several books on investigations into serial killers Christopher Halliwell, Peter Sutcliffe, Angus Sinclair and Robert Black. He participated in a major ITV documentary on Sutcliffe following his death in 2020. Tim Hicks is a retired chartered accountant with experience in audit, fraud investigation and data processing. He was an officer in the Territorial Army, where he received training in intelligence collation and assessment. Tim is now a member of the National Union of Journalists and the Crime Writers Association, writing on crime and intelligence subjects. His research has been published in The Times, Sunday Express, Daily Mirror, Sun, Private Eye, North Yorks Enquirer, Yorkshire Post, Birmingham Post and The Journalist.