<p>The hunt for Diane Sindall’s killer uncovers another victim who was dressed in yellow and attacked near the scene on the same night, raising fears of a serial attacker in Birkenhead.</p><p>A police appeal focuses on the mysterious “woman in yellow”. As the investigation continues, the police uncover more attacks on women in the area and frustrations grow as leads collapse. </p><p>Meanwhile, details of Diane’s injuries intensifies public fear and puts pressure on the police to find an answer.</p><p>Presenter: Olivia Graham. Producers: Kate Bissell, Gemma Maull and Olivia Graham. Sound Design and Music Composition: Phil Channell. Mixing: Ivan Eastley. Story Consultants: Neil McCarthy, Jack Kibble-White and Kirsty Williams. Online Producer: Rachael Smith. Development was by BBC Audio Scotland and BBC Merseyside. Executive Editors: Gillian Wheelan and Ben Anderson. Commissioning Editor: Alistair Miskin.</p><p>There’s graphic descriptions of violence in this series. For details of help and support in the UK, visit bbc.co.uk/actionline.</p>