The final Endeavour of the season, aptly named Coda, is a surprising one as Endeavor takes his sergeant's exam and Thursday receives some news.
Thursday and other police watch the funeral of Cedric Clissold, a garment factory owner, sure that the Matthews brothers will be taking over the crime organization led by the late Harry Rose. They are taking film of the different men. Meanwhile, Morse is taking his sergeant's exam.
Morse runs into an old professor, Felix Lorimer, who is now separated from his young and beautiful wife Nina. He asks Morse to investigate her boyfriend, Paul Morlock -- someone in cahoots with the Matthews brothers - as he is afraid Nina is in danger.
It turns out that Morlock is also seeing Thursday's daughter Joan. Nina thinks that Felix killed Cedric. Morse does learn that Felix has a connection to the seedier parts of Oxford.
Thursday has been suspended after his attack on a suspect previously, and he now receives devastating news from his doctor. Then Morse, Nina, and Joan Thursday are held hostage when the Matthews gang robs the bank where Joan works. While being held there, Morse manages to figure out just what's going on, and who killed Cedric Clissold.
A very poignant episode, with Morse coming to a realization, Joan making an important decision, and Thursday coughing incessantly. It really tugged at the heart, besides offering up a few twists. Probably the best of the season, and it makes me look forward to the next one. Hope we see it soon.