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.

The death of a foreign ambassador draws Eliza into a high-stakes investigation; at the behest of the Governess, Eliza teams with Blake and a formidable woman whose intellect matches her own.

Tommy and Tuppence visit an aunt in her nursing home; Tuppence is concerned by some odd behaviour of the staff and residents, and when she hears of Aunt Ada's death, she asks Miss Marple for help.

Murdoch investigates the murder of an up-and-coming composer as Brackenreid decides upon a new hobby of playing the cello.

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.

Jolyon discovers that he has fathered illegitimate twins; Soames's father plots to use Jolyon's secret to discredit him whilst Soames, who is smitten by Irene, makes a hasty marriage proposal.

Tommy and Tuppence visit an aunt in her nursing home; Tuppence is concerned by some odd behaviour of the staff and residents, and when she hears of Aunt Ada's death, she asks Miss Marple for help.

When a woman is stabbed in her university dormitory room, Crabtree and Watts suspect that another student is responsible.

When a man dies in a drunken brawl at the Starbright Lounge, Murdoch's suspect is another detective.

Karl Alberg, a former big-city detective, relocates to a small coastal town to find solace only to encounter a string of murders; when a resident is bludgeoned, Alberg suspects another local resident.

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.

Jolyon discovers that he has fathered illegitimate twins; Soames's father plots to use Jolyon's secret to discredit him whilst Soames, who is smitten by Irene, makes a hasty marriage proposal.

Appointed as Acting Inspector, Murdoch oversees the case of a prominent medical scientist who may have faked his own death.

Murdoch and Crabtree participate in a battlefield re-enactment where one of the pretend soldiers is murdered.

While celebrating a high school reunion, Cassandra's former classmates discover a dead body at a marina; Alberg investigates the resident's identity and the murder while unravelling a mystery.

A snow blizzard sets in and Miss Marple is forced to take refuge at Sittaford House; when the owner of the house is later found dead in his room, Miss Marple investigates the case.

Prince Henri returns from war with a new mistress, Filippa, and a baby. Catherine resorts to extreme measures to produce an heir.

Camille's revenge mission leads her back to Valmont as he embarks on his most challenging seduction yet.

Appointed as Acting Inspector, Murdoch oversees the case of a prominent medical scientist who may have faked his own death.

Murdoch and Crabtree participate in a battlefield re-enactment where one of the pretend soldiers is murdered.