Kenneth Branagh is back as Inspector Kurt Wallander in the final season of Wallander, based on the novels of Henning Mankell. Dealing with northern Europe's most violent and deranged criminals, Wallander also battles personal demons and appalling health habits, which led him to be diagnosed with diabetes. Now, as he starts to lose his memory, his greatest fear is that he is succumbing to the same disease that felled his father: Alzheimer's.