In this year's extra-scary, ultra-spooky Treehouse of Horror, Marge gets a horrifying new perspective on marriage; Bart and Santa's Little Helper embark on a bone-chilling adventure; and Homer takes a driving lesson.

When Kayce and Andrea's off-hours fugitive hunt unexpectedly reveals the whereabouts of a notorious bomber who previously slipped through Cal's fingers, the team is pulled into a dangerous pursuit that threatens to open old wounds. Meanwhile, threats against Belle move frighteningly close to home, and Miles finds himself hiding crucial information from Maddie about Cal's cancer.

Briar makes a surprising discovery about her mom.

Mark and Rhoda team up to beat the DelVecchios in a dance competition. Tammy and Kardgen help with an organ delivery.

When Emily's HR review threatens her reinstatement, Frank appoints himself her investigator.

When a woman disappears after helping a terrified teenage runaway, Colter uncovers a disturbing case of abuse and embarks on a desperate search to save them both.

With an injury and his investigation shut down, Maigret and his team continue investigating Adeline's past from his apartment. When they uncover she was only the latest of three violent deaths, Maigret must decide whether to destroy two more lives.

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Alliances fracture as the voyage wears on; Bess and Graham play a cat-and-mouse game, while Long John targets Jim; when Graham makes his move, the truth surfaces; the consequences are deadly and Jim is forced to take control of his fate.

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After rooting out the mole in the CIA, Reece, Freddy, and Ground Branch deploy to Al-Nawaz's next meeting location to cut Al-Qaeda off at the head before they can make their next attack against the West. Raife follows Katie's latest lead on the "Kestrel" conspiracy and seeks the help of an unexpected ally to expose the people behind it.

D becomes an anti-corporate vigilante and asks Roman to film his every move. Weak looks into rumors of tech that can transfer digitized consciousness.

Flute is suspicious of Summers' new cyborg friend. Martinez joins the Satanic church for the childcare perks.

En route to wine country, Joanne and Noah meet a messy podcast superfan who reminds Joanne of her younger self - and threatens to derail their weekend.

Fred wrestles with selling the false immunity agreement to Tony over the air, taking the story back to 1972.

Victoria Coren Mitchell hosts the quiz where knowledge only gets you so far. Neither team is leaving the tournament this time, but the questions are as challenging as ever.

After discovering that the person responsible for Ricardo's death is someone close to him, Michael scrambles for a way to protect them from the consequences - without jeopardising Diana.

Pierre is reeling from his son Eli's attack and the cryptic warning it brings. And he's soon drawn back into Michael's case when Brenda is arrested while protesting at the police station.

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