The new trilogy of films mark Endeavour and his colleagues entering a new decade and era of change. Opening on New Year's Eve 1970, 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, and the new series will see old friendships challenged and new relationships blossom. In the dawn of women's liberation, social progression and scientific growth, the 1970s begin for Oxford's finest with the discovery of a body at the canal towpath on New Year's Day. With the only clue in the investigation a witness who heard whistling on the night of the crime, the team have their work cut out to uncover their culprit.With a strong, overarching plot connecting the three films, the seventh series will test Endeavour's moral compass to breaking point, both personally and professionally.