Last seen languishing in a prison cell and framed for a crime he didn't commit, Endeavour is compelled to return to duty when a young woman's baffling murder requires his singularly cerebral mind to solve.

Endeavour and his colleagues are entering a new decade and era of change. Opening on New Year's Eve 1969, normal order has been resumed and the team reunited at Castle Gate CID, with Chief Superintendent Bright back in charge. However, the events of the past year have left their mark. Old friendships will be challenged, and new relationships will blossom.

"October, 1940. Manchester, England. As valiant Jewish RAF pilot David defends the skies against the Luftwaffe, Harry and Kasia finally arrive home. How will Robina cope with another refugee under roof? When yet another house guest arrives -- Sir James, a civil servant on official business -- he looks set to beguile his host, but will Kasia be charmed as well? Meanwhile, in Berlin, teenager Marga is selected to mother a baby for the F�uhrer, but...

It is a new century and with it comes the promise of a hopeful future, but the past casts a long shadow over Cornwall. Following the death of Elizabeth, Ross Poldark resolves to put Westminster behind him and spend more time with the people he loves. However, when an old friend emerges with a plea for help, Ross is compelled to challenge the establishment again.