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Morse is haunted by his past when he investigates the apparent suicide of a terminally ill Oxford don and finds that he has an unexpected connection with the family.

Morse investigates when the founder of a private hospital is found dead and the father of one of the victim's patients is the prime suspect.

When a host is murdered at his own bridge party, Poirot uses psychology and the bridge scores to deduce the identity of the killer.

Tensions flare between Isobel and Cora, Ethel's flirtation with Major Bryant lands her in hot water, and there is worrying news about Matthew.

Robert receives shocking news from the front, Daisy's relationship with William moves faster than she would like, and Vera threatens to expose old secrets.

Carlisle threatens to ruin Mary if she jilts him, a newly-arrived major's identity is questioned, and Bates learns that Vera has scuppered the divorce.

Sybil and Branson attempt to keep their secret, Carlisle puts Anna in a difficult position, and Bates is left reeling from the news about Vera.

There is excitement in the air with the wedding approaching, Spanish flu reaches Downton, and a decisive Anna forces Bates to think about their future.

Poirot is attending a dinner party when one of the guests chokes to death on a cocktail - can it be murder with no trace of poison and no apparent motive.

Antoine and Marine investigate a murder at a university and question the professors and students, but they uncover more crimes the further they delve.

Now working as a consultant for the police, Marine helps Antoine and Helene investigate the death of an aristocrat found dead at his crumbling chateau.