Dramatizing one of the most infamously notorious and shocking serial killer cases in the world, the hunt for Peter Sutcliffe, commonly dubbed the Yorkshire Ripper, between October 1975 and January 1981, South Yorkshire police undertook the biggest manhunt in British criminal history. The search for Sutcliffe lasted five years, involved over a thousand officers and changed the way the British police worked forever.

The mysterious disappearance of a Scottish fishing trawler and a death on-board the submarine HMS Vigil bring the police into conflict with the Navy and British security services. DCI Amy Silva and DS Kirsten Longacre lead an investigation on land and at sea into a conspiracy that goes to the very heart of Britain’s national security.

Five years after meeting her three fathers, Sophie Sheridan prepares to open her mother’s hotel. In 1979, young Donna Sheridan meets the men who each could be Sophie’s biological father.