966 brings Endeavour a fresh quartet of baffling mysteries set to test his brain and body to breaking point. Though offset by the possibility of love unlooked for, against a backdrop of growing change in Britain and the wider world, Endeavour must face a challenge that threatens to take from him all he holds dear... Family. Friends. Colleagues. The old order changeth... but not without a fight. To the death.

Overview from themoviedb.org