It’s a simple enough favor. Jude hasn’t seen Liam in years, but when he shows up at her work asking for a favor, she finds she can’t refuse. All Jude has to do is pick Liam up at a country train station—without telling anyone. So what if she has to lie to her fiancé? Jude is still committed to him and their imminent wedding, even if she and Liam were in love once. She owes him.

Ellie Falkner’s world has been destroyed. Her husband, Greg, died in a car crash - and he wasn’t alone. In the passenger seat was the body of Milena Livingstone, a woman Ellie’s never heard of. But Ellie refuses to leap to the obvious conclusion, despite the whispers and suspicions of those around her. Maybe it’s the grief, but Ellie has to find out who this woman was - and prove Greg wasn’t having an affair. And soon she is chillingly certain their deaths were no accident.

Imogen and Beck, two sisters who couldn't be more different, have been friends with Tilda since high school. Once inseparable, over two decades, the women have grown apart. But after Imogen survives a traumatic attack, Beck suggests they all reunite to hike deep into the Grand Canyon’s backcountry. A week away, secluded in nature...surely it’s just what they need. But as the terrain grows tougher, tensions from their shared past bubble up. And when supplies begin to disappear, it becomes clear secrets aren’t the only thing they’re being stalked by.

Recently laid-off from his newspaper and desperate for work, war correspondent Nick Bishop takes a humbling job: writing a profile of a new mindfulness app called Clarity. It’s easy money, and a chance to return to his hometown for the first time in years. The app itself seems like a retread of old ideas — relaxing white noise and guided meditations. But then there are the “Sleep Songs.” A woman’s hauntingly beautiful voice sings a ballad that is anything but soothing — it’s disturbing, and more of a warning than a relaxation — but it works.

Chloe is one of seven students at her DC-based college who are part of an unusual clinical study of psychopaths - students like herself who lack empathy and can’t comprehend emotions like fear or guilt. The study, led by a renowned psychologist, requires them to wear smart watches that track their moods and movements. When one of the students in the study is found murdered in the psychology building, a dangerous game of cat and mouse begins, and Chloe goes from hunter to prey.

On a beautiful October morning in rural Maine, a homicide investigator from the state police pulls into the hard-luck town of Copper Falls. The local junkyard is burning, and the town pariah Lizzie Oullette is dead - with her husband, Dwayne, nowhere to be found.

When Bonnie Graham arrives at her boyfriend’s apartment in London, she is horrified to discover a dead body in a pool of blood on the floor. But she doesn’t call the police. Bonnie hides the corpse and then carefully wipes away any evidence she was ever there. Bonnie is a music teacher who spent a long, hot summer in London rehearsing with a band to play at a friend’s wedding. It was supposed to be fun, but the band members find the complicated knots of their friendships - some old, some new - unraveling as the days themselves unwind.

It should have been just a mid-life fling. A guilty indiscretion that Neve Connolly could have weathered. An escape from 20 years of routine marriage to her overworked husband, and from her increasingly distant children. But when Neve pays a morning-after visit to her lover, Saul, and finds him brutally murdered, their pied-à-terre still heady with her perfume, all the lies she has so painstakingly stitched together threaten to unravel.

Newlyweds Lina and Cain don’t make it out to their property on gorgeous Lake Tarawera as often as they’d like, so when Cain suggests they rent the house out to vacationers, Lina reluctantly agrees. While the home has been in her family for generations, they could use the extra money. And at first, Lina is amazed at how quickly guests line up, and at how much they’re willing to pay. But both Lina and Cain have been keeping secrets, secrets that won’t be put off by fresh paint or a new alarm system. And someone has been watching them.

On the muddy banks of the Calumet River, a body has been found posed next to a series of mysterious glyphs and bearing wounds from a ritualistic slaying. Chicago detective Addie Bisset knows only one man who can decipher the message left by the killer: her friend Dr. Evan Wilding. A brilliant forensic semiotician, Evan decodes the etchings as Viking Age runes. They suggest either human sacrifice or righteous punishment. But to what god? And for what sins? Only one thing is clear from the disturbing runic riddles: there are more victims to come.

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.

Camille Gardener is a grieving - and angry - mother who, five years after her daughter’s death, is still obsessed with the privileged young man she believes to be responsible. When her rash actions draw the attention of a secret group of women - the collective - Camille is drawn into a dark web where these mothers share their wildly different stories of loss as well as their desire for justice in a world where privilege denies accountability. Fueled by mutual rage, the collective members devise and act out retribution fantasies via anonymous, highly coordinated revenge killings.

When Dr. Philip Taiwo is called on by a powerful Nigerian politician to investigate the torture and murder of three university students in Port Harcourt, he has no idea that he’s about to be enveloped by a perilous case that is far from cold. Philip is not a detective. He’s an investigative psychologist, an academic more interested in figuring out the why of a crime than actually solving it. But when he steps off the plane and into the frenzy of the provincial airport, he soon realizes that the murder of the Okriki Three isn't as straightforward as he thought.

Ruth is a no-nonsense 40-something journalist from the Midwest desperate for a child with her new husband, Hal. Their hope rests with Cally, a 19-year-old who wants to go to college - but doesn’t have the cash. The arrangement seems perfect for everyone. But within a day of the baby’s birth, Cally has a change of heart - and engineers a harrowing escape from the hospital with the newborn. When Ruth and Hal discover that Cally and their daughter are gone, a whole series of doubts and secrets is revealed, and the difference between right and wrong is no longer clear.

It happened the day of the Moon Festival. It could have been left behind, they all could have moved on with their lives. But secrets have a habit of rising to the surface, especially in small towns. Two couples, four ironclad friendships, the perfect coastal holiday town. With salt-stung houses perched like lifeguards overlooking the shore, Lago Point is the scene of postcards, not crime scenes. Wife and mother Abbi, town cop Blake, schoolteacher Hannah and local doctor Will are caught in their own tangled webs of deceit.

London cycle courier Astrid Bell has known most of her housemates for years, but while they have a tangled history together - romantic pairings, one-night stands, friendships - they each have secrets. Astrid is on her way home one day when her neighbor accidentally knocks her off her bike. Suffering a few bruises, her roommates help her home. The next day, they learn that same neighbor was bludgeoned to death only hours after the accident.

It should have been just a mid-life fling. A guilty indiscretion that Neve Connolly could have weathered. An escape from 20 years of routine marriage to her overworked husband, and from her increasingly distant children. But when Neve pays a morning-after visit to her lover, Saul, and finds him brutally murdered, their pied-à-terre still heady with her perfume, all the lies she has so painstakingly stitched together threaten to unravel.

Nancy North is ready to put her life back together. After suffering a psychotic break that ruined friendships, stalled her fledgling restaurant, and forced her to move out of her comfortable flat, she’ll do anything to get back to normal. She and her partner Felix—who has been a saint through her recent troubles—move into a new flat for a fresh start. Nancy is taking her pills, seeing her therapist, and avoiding unnecessary stress. She’s doing absolutely everything right, but something is still very, very wrong. On the first day in the new flat, she hears them again.

Astrid Bell has known most of her roommates for years, but while they have a history together - romantic pairings, one-night stands, friendships - each of them also has a past. Astrid is on her way home one day when her neighbor knocks her off her bike. Seeing she is bruised but not broken, her roommates help her home. The next day, they learn that same neighbor was beaten to death hours later. Each of them tells the police what they know and are dismissed - until Astrid stumbles over another body.

It’s a simple enough favor. Jude hasn’t seen Liam in years, but when he shows up at her work asking for a favor, she finds she can’t refuse. All Jude has to do is pick Liam up at a country train station—without telling anyone. So what if she has to lie to her fiancé? Jude is still committed to him and their imminent wedding, even if she and Liam were in love once. She owes him.