A history professor is murdered in a friend's home. Lewis and Hathaway's investigations lead them to the University's boxing club, the husband-and-wife owners of a posh restaurant and a connection with the East German Stasi during the Cold War. Somehow all these factors lead to this man being murdered.
A fairly intriguing episode of Lewis. Doesn't have anything like the wonderful emotional and sentimental aspect that the previous episode had but the mystery side is very good.
Does get a bit too complex for its own good at the end several possible suspects and motives are pursued. Similarly, Lewis goes full Morse and starts accusing people until someone gives themselves away.
On the subject of Morse, the writers are clearly imbuing Lewis with the same quality as Morse in that he falls for a woman who happens to be a suspect and could well be the murderer. That constant feature was irritating in the Morse plots as it showed lack of judgement and professionalism and it's hardly more palatable here. At least Lewis seems to be less actively seeking the relationship.