The Newcastle police arrest rioters as they try to clear a slum due for demolition; the next morning, one of the protesters is discovered dead in the cells by WPC Rachel Coles.

The team are in Almonte, a village outside Ottawa, when its mayor Alex McKenzie is found dead in the gymnasium equipment room after being crushed under a barbell.

Violet Hart and her progressive entrepreneurial associate Cassiopeia Bright attend an event in Niagara where a protest leader is found murdered with an ominous message smeared in blood.

Murdoch and Crabtree investigate when a man's body is found in the cellar of a Korean-family's home and shop; the Parks called the police after they heard strange moaning through its vents.

The fate of a struggling young widow causes difficulties for James and Helen's burgeoning romance, and a visit from Tricki Woo causes chaos in Skeldale House.

It's a very important day for Tristan, but a painful secret threatens to ruin celebrations, and James' efforts to protect Helen from his own problems only makes things worse.

James has to settle old scores both on and off the playing field when a familiar face returns to Darrowby, and Tristan and Siegfried must acknowledge their differences.

James has to make a big decision about his future in Darrowby - meanwhile, Tristan's next steps are informed by a chance meeting with an unexpected outsider.

Murdoch and Crabtree investigate when a man's body is found in the cellar of a Korean-family's home and shop; the Parks called the police after they heard strange moaning through its vents.

When a young woman is robbed and murdered in her home adjacent to an itinerant encampment, Murdoch, Brackenreid, and Watts look to the vagrants for a suspect.

Murdoch investigates when a mathematician participating in the demonstration of James Pendrick's new picture-transmitting communication device is killed while a room of investors watches in horror.

After a musician is found murdered in an alley with an array of wounds, Watts tells Murdoch and Hart that the crime was documented in a song he heard sung the previous night at Cassiopeia's nightclub.

Crabtree is shocked when Amelia Ernst, one of the deranged sisters who abducted him, turns herself in; Effie intends to make her face the full force of justice but is hobbled by a clever lawyer.

A woman's body is found brutally attacked; Gently wants to stop the killer from attacking again and becomes keen to get to the bottom of another mystery that is unfolding in the police.

Gently is intrigued as to why a woman has tragically died by suicide as there are too many details that don't add up, so he puts his career on the line to uncover who is really to blame.

Grief boils into vengeance as Rob crosses a moral line he can never uncross; the innocence in him dies forever, and what rises in its place will shape the future of England and the legend to come.

Mary and Sam embrace change at home and in business, despite a looming national recession. Joe, Liza and Harry try to find their way in the world. The Fitzherberts welcome a guest: Emma's mother.

When serial killer Tommy Cummins offers to reveal the locations of his remaining victims, he insists on speaking only to Alberg, the detective who put him away.

Kent, 1985: Joan O'Connell is a young mother trapped in a catastrophic relationship with criminal Gary Darvil - she flees and takes drastic action to keep her six-year-old daughter Kelly safe.

Mary and Sam embrace change at home and in business, despite a looming national recession. Joe, Liza and Harry try to find their way in the world. The Fitzherberts welcome a guest: Emma's mother.

A woman's body is found brutally attacked; Gently wants to stop the killer from attacking again and becomes keen to get to the bottom of another mystery that is unfolding in the police.