Miss Marple revisits the glamorous Bertram's Hotel in the heart of London and realises that the truth behind it is darker than even she had imagined when one of its maids is found murdered.

Jacko Argyle died in prison having been convicted of murdering his adoptive mother; Dr Arthur Calgary proves that Jacko was actually with him at the time of the murder, proving his innocence.

James and Helen are keeping a secret, Carmody is challenged with learning how to be a vet following a visit to Crabtree's Farm, and new farmers have a worrying illness amongst their herd.

James is about to embark on a new journey; he wants things in order and Carmody trained up to support Siegfried, but his grand plans are derailed when an injured cat is brought into the practice.

Helen feels redundant at Skeldale; she returns to Heston Grange when Richard Alderson needs help, but family secrets threaten to tear their relationship apart as Richard refuses to let her muck in.

It's Christmas in the Dales; faced with a daunting future, James is desperate to see Helen.

Soames and Irene honeymoon in Paris while James is furious after Soames plans to set up a branch of Forsyte & Co. in Paris; Soames, who is horrified by a ballet, returns to London early.

Disaster strikes at Forsyte & Co. and causes clients' financial ruin, Soames tells Irene that James has a heart condition, and Jo refuses to cut Louisa out of his life and finds her a cottage instead.

Soames commissions Phil to build him an isolated country house ignoring Irene's suggestion they admit defeat in their marriage, Jolyon leaves the family for Louisa, and Ann has another grandson.

When Crabtree and Effie attend a celebration of Charles Dickens' birth, the host winds up mysteriously dead.

Murdoch, Watts and Choi investigate the cocaine overdose death of a bookkeeper living in new workers' housing.

In the summer of 1955, a young woman is stabbed to death and is the fourth to be killed in a few weeks. Can Maigret find the killer before he strikes again?

Maigret's determination to find the murderer of a man who called him just a few hours before being killed eventually leads to a gang who slaughtered families in Picardy.

Rob risks everything to save the Miller family from Norman justice; in Westminster, Marian's fragile position at court is shaken to its core by the devastating news of her brother's death.

Sam and Mary organise a servant's ball. Liza introduces Edward to her family, but Ma is suspicious. Tensions rise between Sam and Joe. Lady Imelda encourages an official to investigate Mary's school.

Spade arrives in Bozouls and falls for a local vineyard owner; he remains a widower and retiree living out his years in peace years later, but the return of an adversary changes everything.

Joan and Boisie buy an engagement ring while the police search for the missing Stubbs painting at Boisie's store; the police find nothing, but Joan is adamant they have to get rid of the painting.

Sam and Mary organise a servant's ball. Liza introduces Edward to her family, but Ma is suspicious. Tensions rise between Sam and Joe. Lady Imelda encourages an official to investigate Mary's school.

In the summer of 1955, a young woman is stabbed to death and is the fourth to be killed in a few weeks. Can Maigret find the killer before he strikes again?