Netflix’s killer new Agatha Christie mystery, Agatha Christie’s Seven Dials, dropped on January 15, 2026, just in time to brighten the dreary winter blues. Marking the 50th anniversary of the Queen of Crime’s death in 1976—when her final novel Sleeping Murder was posthumously published—this lavish three-part miniseries reimagines her 1929 novel The Seven Dials Mystery for modern viewers.

Set in 1925 England, the story unfolds at the grand but financially strained country estate of Chimneys, home to the aristocratic Caterham family. Lady Caterham (Helena Bonham Carter), mourning recent losses, reluctantly rents out the property for a lavish party hosted by wealthy industrialist Sir Oswald Coote. What starts as a playful prank—seven synchronized alarm clocks placed around the house to wake guests at dawn—turns deadly when young diplomat Gerry Wade is found poisoned amid the ticking timepieces.

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Enter the spirited Lady Eileen “Bundle” Brent (Mia McKenna-Bruce), daughter of the house, whose sharp curiosity and determination drive her to investigate. Far from a passive debutante, Bundle uncovers a tangled conspiracy involving a secret society known as the Seven Dials, espionage, stolen secrets, and hidden motives among the glamorous guests. Her sleuthing exposes darker post-war themes of empire, grief, and betrayal beneath the glittering surface.

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Helena Bonham Carter shines as the eccentric, grief-haunted Lady Caterham, her wide-eyed intensity and cryptic presence adding emotional depth and intrigue.

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Martin Freeman brings steady authority as Superintendent Battle of Scotland Yard, his stern mustache, piercing gaze, and dry wit grounding the chaos as he methodically pursues leads.

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Written by Chris Chibnall and directed by Chris Sweeney, the series blends breezy 1920s glamour—candlelit ballrooms, opulent costumes, foggy drives—with tense suspense and a more action-oriented finale. The cast includes Edward Bluemel as charming suspect Jimmy Thesiger, plus Iain Glen, Nabhaan Rizwan, and others weaving a web of red herrings and twists faithful to Christie’s plotting yet amplified with contemporary emotional stakes.

Critics praise the standout performances and cozy-yet-thrilling vibe (74% on Rotten Tomatoes), though some note the darker imperial undertones diverge from the novel’s lighter tone. As a limited series, it’s a perfect binge for mystery lovers seeking escapist elegance amid January gloom.