Hercule Poirot's quiet supper in a London coffeehouse is interrupted when a young woman confides to him that she is about to be murdered. She is terrified - but begs Poirot not to find and punish her killer. Once she is dead, she insists, justice will have been done. Later that night, Poirot learns that three guests at a fashionable London Hotel have been murdered, and a cufflink has been placed in each one’s mouth. Could there be a connection with the frightened woman?

Celebrating her forty-fifth birthday at her local pub, popular podcaster Alix Summer crosses paths with an unassuming woman called Josie Fair. Josie, it turns out, is also celebrating her forty-fifth birthday. They are, in fact, birthday twins. A few days later, Alix and Josie bump into each other again, this time outside Alix’s children’s school. Josie has been listening to Alix’s podcasts and thinks she might be an interesting subject for her series. She is, she tells Alix, on the cusp of great changes in her life.

The residents of the exclusive cul-de-sac on Alton Road are entangled in a web of secrets and scandal utterly unknown to the outside world, and even to each other. On the night of the annual summer block party, there has been a murder. But, who did it, and why, takes listeners back one year earlier, as rivalries and betrayals unfold. The real danger lies within their own block and nothing—and no one—is ever as it seems.

One year ago, Lucy’s sister, Nicki, left to meet friends at a pub in Dublin and never came home. The third Irish woman to vanish inexplicably in as many years, the agony of not knowing what happened that night has turned Lucy’s life into a waking nightmare. So, she’s going to take matters into her own hands. Angela works as a paper-pusher in the Missing Persons Unit, but wants nothing more than to be a fully fledged member of An Garda Síochána, the Irish police force. With the investigation into the missing women stalled, she begins pulling on a thread that could break the case wide open.

Nine people gather at a remote health resort. Some are here to lose weight, some are here to get a reboot on life, some are here for reasons they can’t even admit to themselves. Amidst all of the luxury and pampering, the mindfulness and meditation, they know these ten days might involve some real work. But none of them could imagine just how challenging the next ten days are going to be.

Early one morning on the shore of the Thames, DCI Samuel Owusu is called to the scene of a gruesome discovery. When Owusu sends the evidence for examination, he learns the bones are connected to a cold case that left three people dead on the kitchen floor in a Chelsea mansion thirty years ago. Rachel Rimmer has also received a shock—her husband, Michael, has been found dead in the cellar of his house in France. All signs point to an intruder, and the French police need her to come urgently to answer questions about Michael and his past that she very much doesn’t want to answer.

Three little girls set off to school one sunny May morning. Within an hour, one of them is dead. Fifteen years later, Kitty lives in an institution. She can't speak and has no memory of the accident that put her there, or her life before it. Nearby, Alison, a local artisan, struggles to make ends meet and to forget her past. When a job opens up in a prison as an art teacher, she takes it. Soon, though, she starts to receive alarming notes - followed by a frightening prisoner-on-prisoner assault while her back is turned.

It’s New Year’s Eve 1999. Y2K is expected to end in chaos: planes falling from the sky, elevators plunging to earth, world markets collapsing. A digital apocalypse. None of that happens. But at a Blockbuster Video in New Jersey, four teenagers working late at the store are attacked. Only one inexplicably survives. Police quickly identify a suspect, the boyfriend of one of the victims, who flees and is never seen again.

Josh Baxter, the man behind the wheel, is a virtual stranger to Charlie. They met at the campus ride board, each looking to share the long drive home to Ohio. Both have good reasons for wanting to get away. For Charlie, it’s guilt and grief over the shocking murder of her best friend, who became the third victim of the man known as the Campus Killer. For Josh, it’s to help care for his sick father - or so he says.

Lydia, Dean, and Robyn live very different lives, but each of them, independently, has always felt that something was missing. What they don't know is that a letter is about to arrive that will turn their lives upside down. It's a letter containing a secret - one that will bind them together and show them what love and family and friendship really mean.

Kit Darling is a maid with a snooping problem. She’s the “invisible girl,” compelled to poke into her wealthy clients’ closely guarded lives. It’s a harmless hobby until Kit sees something she can’t unsee in the home of her brand-new clients: a secret so dark it could destroy the privileged couple expecting their first child. This makes Kit dangerous to the couple. In turn, it makes the couple—who might kill to keep their secret—dangerous to Kit.

Two Truths and a Lie. The girls played it all the time in their cabin at Camp Nightingale. Vivian, Natalie, Allison, and first-time camper Emma Davis, the youngest of the group. But the games ended the night Emma sleepily watched the others sneak out of the cabin into the darkness. The last she - or anyone - saw of them was Vivian closing the cabin door behind her, hushing Emma with a finger pressed to her lips. Now a rising star in the NYC art scene, Emma's paintings catch the attention of Francesca Harris-White, the socialite and wealthy owner of the very same Camp Nightingale.

Olivia Bender designs exquisite home interiors that satisfy the most demanding clients. But her own deepest desire can’t be fulfilled by marble counters or the perfect rug. She desperately wants to be a mother. Fertility treatments and IVF keep failing. And just when she feels she’s at her lowest point, the police deliver shocking news to Olivia and her husband, Park. DNA results show that the prime suspect in a murder investigation is Park’s son. Olivia is relieved, knowing this is a mistake. Despite their desire, the Benders don’t have any children. Then comes the confession.

Everyone has secrets, and Rachel Holloway is no exception. She’s worked hard to keep the past where it belongs: dead and buried. And so far, she’s been very successful. But now the small newspaper where she works wants to produce a podcast on a cold case: the disappearance 12 years ago of young Molly Forster. Some secrets should never see the light of day, and, as far as Rachel is concerned, whatever happened to little Molly is one of them.

After a personal tragedy and professional scandal forces homicide detective Vanessa Castro out of Seattle, she takes a new job in Seaside, Washington, determined to make a fresh start. The small beach town, best known for its popular amusement park, Wonderland, seems like the perfect place to raise her young son and teenage daughter. But it's not that easy starting over, especially as the town's new Deputy Chief of Police. When a dead body turns up at the park her first day on the job, and then a teenage Wonder Worker goes missing, Vanessa's investigation is met with resistance.