El cuento se centra en Elspeth McGillicuddy, una anciana que está de camino a visitar a su amiga Jane Marple durante las vacaciones navideñas. Durante su viaje en tren, Elspeth presencia un asesinato en un tren que pasa junto al suyo. Ve a una mujer siendo estrangulada por un hombre en un compartimento del otro tren. Sin embargo, cuando llega a su destino y reporta el crimen, las autoridades no encuentran evidencia alguna del asesinato y dudan de su historia. Desesperada por encontrar respuestas, Elspeth recurre a su vieja amiga Miss Marple para ayudarla a resolver el misterio.

La historia comienza con una joven llamada Norma Restarick, quien visita la residencia de Miss Marple en St. Mary Mead. Norma está preocupada y le cuenta a Miss Marple que siente que algo extraño está sucediendo en su vida y que alguien podría estar tratando de dañarla. Miss Marple, intrigada por la historia, decide investigar. A medida que indaga, descubre que Norma comparte un apartamento en Londres con dos otras mujeres y que ha habido tensiones entre ellas, especialmente después de la aparición de una muñeca extraña en su habitación.

Arthur Hastings, amigo del famoso detective Hercule Poirot, visita Marsdon Manor, una mansión inglesa, donde ocurre un misterioso asesinato. El señor Maltravers, un hombre rico y enfermo, es encontrado muerto en su habitación, aparentemente de un ataque al corazón. Sin embargo, Poirot sospecha que hay más de lo que parece y comienza a investigar.

Hasta el momento, en todos los casos que yo he relatado, las investigaciones de Poirot se iniciaron partiendo del factor central, ya fuese crimen o robo, y fueron siguiendo un proceso de deducciones lógicas hasta llegar a la solución final. En los acontecimientos que ahora voy a relatar, una curiosa cadena de circunstancias tuvo su principio en ciertos incidentes aparentemente triviales que atrajeron la atención de Poirot y culminó en los siniestros sucesos que constituyeron uno de los casos más extraordinarios.

Poirot y Hastings invitan al inspector James Japp, de Scotland Yard, a tomar el té en su casa. La conversación gira alrededor de la reciente desaparición de un famoso banquero y financista, el señor Davenheim; de su gran mansión de campo. Poirot apuesta con Japp cinco libras a que será capaz de resolver el caso en una semana sin moverse de su silla, siempre y cuando pueda contar con todos los detalles de la investigación. ¿Logrará Poirot esclarecer el misterio sin siquiera acercarse al lugar de los hechos?

Un valioso bono del gobierno de Estados Unidos por un millón de dólares es robado durante un viaje en barco a Nueva York. El ladrón es desconocido y se plantea un enigma aparentemente insoluble. El famoso detective privado Tommy y Tuppence Beresford son contratados para resolver el caso. Tommy y Tuppence investigan a los diversos pasajeros del barco, descubriendo una red de intrigas y sospechas.

El detective Hércules Poirot es contratado por la señorita Violeta Marsh para resolver un extraño caso. La muchacha ha sido desafiada por su tío fallecido, Andrew Marsh, y sólo recibirá la enorme fortuna que debe heredar si logra probar su inteligencia.

Un empresario minero contrata a Poirot para resolver el brutal asesinato de su hija y el robo de sus joyas a bordo del expreso de Plymouth.

Poirot y Hastings están reunidos con su vecino, el doctor Hawker, cuando reciben un mensaje urgente: el conde Foscatini, paciente del médico, ha implorado por ayuda. "Me han asesinado", ha atinado a decir a quien lo atendió telefónicamente.

El señor T.X. Benedict recibe una carta anónima invitándolo a una casa de campo llamada Hunter Lodge donde se revelará un misterio. Benedict acepta la invitación y llega a la mansión, donde conoce a los otros invitados, incluyendo a Sir Eustace Pedler, el anfitrión de la casa. Sir Eustace revela que ha sido amenazado de muerte y Benedict se ofrece para investigar el caso.

Timothy and Jonah, wealthy entrepreneurs with a spoiled son, hide sins from their past—one involving a death on a cruise, the other a crime in Bali. Nathan and Samantha, the hot ex-nanny turned trophy wife, grapple with infertility and a shocking paternity secret. Bartosz and Angelika (he’s a chef, she’s a former sex worker) carry debts to the other couples they don’t even realize they owe. Over fourteen days, the couples bond—but their pasts are too deeply intertwined to stay hidden. The sly concierge, Putu, knows more than he lets on.

Lana Fleming’s sister has vanished from the set of TV’s hottest show, and no one seems to care. Desperate for answers, Lana sneaks in as an extra, only to get stranded with Griffin Hart, an A-list action star with a reputation for good abs and bad decisions. Though Griffin didn’t expect to be cast as a librarian’s sidekick in a real-life thriller, he’s weirdly into it—and into her. Even more unsettling—she sees right through his playboy persona. But their meet-cute soon turns deadly when they uncover a Hollywood scandal for the ages.

Sometimes the darkest mysteries are homegrown. When Zephyr Nelson returns home to look after her ailing mother, she discovers that her younger brother, Cotter, has become obsessed with a malevolent influencer on a mysterious voice app. Just as a series of puzzling deaths begin plaguing their small town of Sugarland. With the help of her college best friend and occasional lover, Teddy, Zephyr unravels truths about Sugarland that are impossible for her to accept ...

Amy Nicols (Lizzy Caplan) was an FBI agent with a dogged need to protect everyone—until that instinct caused her to mishandle a crisis, lose innocent lives, and lose her job. Now a civilian working in private security, that mistake still haunts her. One morning on the commuter train, she overhears a young couple plotting a murder. Ignoring warnings from her family and friends, Amy’s instinct to protect and serve compels her to investigate. But the further she goes, the more she finds her own life in danger.

Nathan Tyler is an unassuming professor at a middling American university with a rather obscure specialty in mathematics—in short, a nobody from nowhere. So why is the White House calling? Summoned to Washington, DC, for a top-secret briefing, Nathan discovers that he’s the key to a massive foreign intelligence breakthrough. Reading between the lines of a cryptic series of equations, he could open a door straight into the heart of the Kremlin and change the global balance of power forever.

Sloan will go through hell and back for those she loves. And she does so, every single day. Caught up with the alluring Asa Jackson, a notorious drug trafficker, Sloan has finally found a lifeline to cling to, even if it’s meant compromising her morals. She was in dire straits trying to pay for her brother’s care until she met Asa. But as Sloan became emotionally and economically reliant on him, he in turn developed a disturbing obsession with her—one that becomes increasingly dangerous every day.

Cassie thinks she has met the perfect man. Joel is sweet, handsome, romantic, and best of all, he’s crazy about Cassie. She thinks she’s found the guy she’ll spend the rest of her life with. Have children with. Grow old with. Yes, she knows about his perfect ex-girlfriend, Francesca. The beautiful, brilliant chef, beloved by all his friends. But she thinks Francesca is out of the picture. She thinks Francesca is gone for good. Think again, Cassie.

It’s 1984, and life has changed beyond recognition. Airstrip One, formerly known as Great Britain, is a place where Big Brother is always watching, and nobody can hide. Except, perhaps, for Winston Smith. Whilst working at the Ministry of Truth, rewriting history, he secretly dreams of freedom. And in a world where love and sex are forbidden, where it’s hard to distinguish between friend and foe, he meets Julia and O’Brien and vows to rebel.

Jazz Bashara is a criminal. Well, sort of. Life on Artemis, the first and only city on the moon, is tough if you're not a rich tourist or an eccentric billionaire. So smuggling in the occasional harmless bit of contraband barely counts, right? Not when you've got debts to pay and your job as a porter barely covers the rent. Everything changes when Jazz sees the chance to commit the perfect crime, with a reward too lucrative to turn down.

Tess Strebel can’t recognize her own face. She can’t recognize her home. Her bedroom is unfamiliar. And she can’t remember the handsome stranger lying next to her in bed. A stranger who claims he’s her husband. Tess reads a letter in her own handwriting, composed during a rare lucid day, explaining her life as it now exists: she was in a terrible car accident one year ago. Every morning, she wakes up unable to remember most of the last decade. Including her own wedding.