The Best Episodes Written By Sarah Phelps

Everything comes to a head as Cassie confronts Lexie’s killer and Rob has a breakthrough about Katy’s murder.

Putting aside gnawing doubts about her marriage, Margaret continues with her plan to secure her claim to Inveraray Castle.

Battlelines are drawn as the Duke and Duchess of Argyll enter into a bloody separation, all played out in the white-hot glare of a ravenous press.

Heiress Rachel Argyll is murdered at her family estate. Eighteen months later, as her widower prepares to marry again, the identity of the murderer is thrown in doubt.

Calgary is determined to prove that Jack died an innocent man, but his alibi puts him in perilous danger of his own.

Despite Rob’s promise to Cassie that they won’t investigate Operation Vestal, they make a dark bargain to keep the secret and carry on working on the cases.

As Cassie struggles to make sense of Lexie’s life and death, we delve into her own difficult past. Meanwhile, Rob’s past finally yields some results in the Katy investigation.

Rob makes costly mistakes as Cassie immerses herself in the art of being Lexie.

Cut down to half their original number, the guests of Soldier Island are in danger of losing their minds to fear and anxiety.

With the ABC killer still on the loose, Hercule realises that only he holds the key to the murders. He faces a race against time to stop the bloodbath.

The village of Pagford is left in shock when a local resident dies suddenly. Pagford is seemingly an English idyll, but what lies behind the pretty façade is a community at war. The empty seat left on the parish council soon becomes the catalyst for the biggest battle the village has yet seen.

The parish council election approaches and Pagford is on tenterhooks awaiting the next post from 'the Ghost of Barry Fairbrother'. Who is the Ghost, and what will they say? Is anyone in the village safe from humiliation? As tensions rise, the finger of suspicion points in many directions.

The parish council election is imminent and tensions rise in Pagford and each side steps up their campaign.

All of Knocknaree mourns as Katy Devlin is laid to rest, while the pressure on Rob and Cassie mounts as there are still no arrests in the case.

Pip starts his new life as a gentleman in London, quickly acquiring expensive tastes and mounting debts. He falls deeper in love with Estella and escorts her around town. As his twenty-first birthday approaches, Pip waits for his benefactor and their intentions to be revealed.

Pip wants nothing to do with Magwitch and rushes to confront Miss Havisham. At Satis House he learns that Estella may be lost to him. Back in London, Wemmick warns him that the penalty for Magwitch's return from Australia will be hanging. Now Pip must help him escape.

In the summer of 2006 detectives Rob Reilly and Cassie Maddox are sent to investigate a child’s murder. They find a community caught between the old Ireland and the new.

The devastating events that led up to Rachel's murder are revealed, and the true identity of her killer is finally unmasked.

It's 1933, and an older and greyer Hercule Poirot receives letters threatening murder. When no-one listens to his appeals, the once great detective must take matters into his own hands.

The ABC killer sends more letters promising to spill blood. Hercule's past, integrity and identity come into question while he fights a rising tide of xenophobia.

A terrifying encounter on the marshes with an escaped convict and a summons from the mysterious Miss Havisham change orphan Pip's life forever. He dares to believe he might be destined for a future beyond the marshes —a future linked to that of the beautiful Estella.

As the sun rises and sets on the island and its solitary mansion, the number of guests is whittled down by their invisible enemy – to seven, to six, to five…

Falcón investigates a number of suicides among Seville's city high-flyers. Doubting the authenticity of the evidence, Falcon finds his life in danger when he discovers the dark secrets and lies that have played a part in the deaths.

Ten strangers are drawn away from their lives to an isolated rock off the Devon coast.

The finale finds Rob and Cassie forced into a face-to-face reunion.As arrests are made, Rob and Cassie both come to profound realisations.