The Best Episodes Directed By Alex Gabassi

As Marcus continues to embrace his Mithraic devotion, Sue worries he may no longer have her and Paul’s best interests at heart. Meanwhile, Mother experiences what she believes to be malfunctions, and Hunter works on a secret project with Father.

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.

Marcus’s decisions stress his relationship to his family as he struggles to maintain his clout as leader of the Mithraic. Mother is able to see Marcus for who he truly is, which threatens his power and puts Mother in a precarious situation she might not recover from. Meanwhile, Campion is faced with a choice that could result in dire consequences.

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.

Mother struggles to keep the collective from falling apart as she struggles to lead while Sue resorts to prayer in her desperation to cure Paul. Meanwhile, Marcus and his followers are given new hope as they discover an ancient temple. But as Marcus investigates the temple’s secrets, Decima and the rest of his followers are made to answer for their sins.

As they try and fail to open the seed box, Sue and Paul realize they need Marcus’s help. Sue makes a plan to break Marcus out of the brig while Mother is distracted with the imminent birth of Tempest’s baby. But when Sue, Paul and Marcus finally open the seed box, they make a horrifying discovery.

In 1946, an Egyptian street vendor finds inspiration in the abdicated King Edward. Years later, he eagerly tries to integrate into British High Society.

When politician's wife and undercover spy Helen Webb learns that her lover has been murdered, the Black Doves recruit an old friend to help protect her.

Memories of Sam's past come back to haunt him as he prepares to finish the job he started seven years ago. Wallace secretly meets with a Chinese envoy.

After reaching a dead end in the search for Jason's killer, Helen has to fight for her own life, while Sam receives a threat from his former employer.

Diana holidays in Saint-Tropez with Al-Fayed and bonds with his son Dodi. Charles is crushed when the Queen won't attend Camilla's 50th birthday party.

An unexpected encounter with the mysterious Frederick Dipple suggests that Marlott needs to protect his allies, who he realizes are increasingly in danger.

After a series of strokes, a declining Margaret recalls a wild night with her sister at the Ritz in 1945, and later celebrates her 70th birthday there.

After heightened public scrutiny, Charles forges a new alliance in Hong Kong. Mohamed Al-Fayed offers his support to a newly-divorced Diana.

John Marlott adopts a new identity and gains employment. He believes someone is lying about the recent murders of local clergymen and he is determined to uncover the truth in his search for justice.

Marlott's new intelligence brings him closer to a solution and leads him to an apparently deserted tower. However, there are darker and colder dangers inside.

London 1830. John Marlott escapes the Bethlem Hospital seeking his revenge on Lord Daniel Hervey. The hunter soon becomes the hunted.

Marlott is convinced that Billy Oates and the origin of the fever killing local families will lead him to Lord Daniel Hervey.

As the police close in John Marlott needs to rescue Esther from Hervey and Dipple, and resurrect both his own and her fortunes in an epic season finale.