For 13 days in 1976, teenage murderers April Cooper and Gabriel LeRoy terrorized Southern California's Inland Empire, killing a dozen victims before perishing themselves in a fire...or did they? More than 40 years later, 20-something podcast producer Quentin Garrison blames his troubled upbringing on the murders. And after a shocking message from a source, he has reason to believe April Cooper may still be alive.

"You need to kill at least three people, right? So that's what I'll do." When Will jokes about becoming a serial killer, his friends just laugh it off. But Adeline can't help but feel there's something more sinister lurking behind his words. Fifteen years later, Adeline returns to Blythe for a reunion of the old gang - except Will doesn't show up. Reminiscing about old times, they look up the details of his supposed murder spree. But the mood soon changes when they discover two recent deaths that match.

Gen is on the verge of a divorce from her cheating husband. When her sister, Meg, has a convention to attend in the Big Apple, she invites Gen along to celebrate her newly found freedom. But the perfect sisters’ getaway quickly goes awry when a tipsy Gen defiantly throws her wedding ring off the hotel room’s balcony. Then, wanting some fresh air, she decides to take a late-evening walk alone and vanishes without a trace.

Widower Jack Harris has resisted the dating scene ever since the shooting of his wife Molly by a fifteen-year-old boy three years ago. An early morning run along the Hudson River changes that when he spots a woman in last night’s party dress, barefoot, enjoying a champagne picnic alone, reading his favorite novel. Everything about her reminds him of what he used to have with Molly. Eager to help Jack find love again, his best friend posts a message on a popular website after he mentions the encounter.

On June 28, 1980 - the hottest night of the year - Kelly Michelle Lund shoots and kills Oscar-nominated director John McFadden at a party in his home...and instantly becomes a media sensation, her chilling smile fodder for national nightmares. For years speculation swirls over the enigmatic 17-year-old's motives, information she's refused to share. Convicted of the murder, she loses her youth and her freedom - but keeps her secrets to herself.

Selena Murphy is commuting home on the train when she strikes up a conversation with a beautiful stranger in the next seat. The woman introduces herself as Martha and soon confesses that she’s been stuck in an affair with her boss. Selena, in turn, confesses that she suspects her husband is sleeping with the nanny. When the train arrives at Selena’s station, the two women part ways, presumably never to meet again.

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 Mel receives an unexpected email from her oldest friend Abi, it brings back memories she thought she had buried forever. Their friendship belonged in the past. To those carefree days at university. But Abi is in trouble and needs Mel’s help, and she wants a place to stay. Just for a few days, while she sorts things out. It’s the least Mel can do. After all, friends look out for each other, don’t they?

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.

The doorbell rings, just days after my beloved husband’s sudden death. I don’t recognise the woman on our doorstep, with her blonde highlights, a diamond bracelet identical to my own and a bouncing baby boy in her arms. As I show her inside, I notice her eyes grow wide as she takes in our spacious hallway, and the big squashy sofas that we all used to pile on. She glances at the silver-framed family photos and my little daughter hiding behind my skirts. She looks at me, her blue eyes serious. ‘I’m sorry’ she says. ‘I am your husband’s girlfriend. And this is his son.'

At an elite private school nestled in the Colorado mountains, Natalie, an office assistant, dreams of having a life like the school moms she deals with every day. Women like Brooke—a gorgeous heiress, ferociously loving mother and serial cheater—and Asha, an overprotective mom who suspects her husband of having an affair. Their fates are bound by the handsome assistant athletic director Nicholas, whom Natalie loves, Brooke wants and Asha needs.

Each of the Maguire brothers has his own driving, single-minded obsession. For Jonathan it is his magnificent, talented, and desirable wife, Harriet. For Roger it is the elaborate universe he has constructed in a shed in their parents' garden, populated by millions of tiny insects. While Jonathan's pursuit of Harriet leads him to feelings of jealousy and anguish, Roger's immersion in the world he has created reveals a capability and talent that are absent from his everyday life.

Faith Finley has it all: She’s a talented psychologist with a flourishing career, a best-selling author, and the host of a popular local radio program, Someone’s Listening, with Dr. Faith Finley. She’s married to the perfect man, Liam Finley, a respected food critic. Until the night everything goes horribly wrong, and Faith’s life is shattered forever. Liam is missing - gone without a trace - and the police are suspicious of everything Faith says. They either think she has something to hide, or that she’s lost her mind.

A girl with a secret. Longbill Beach, 1982. Emily Vaughn gets ready for the prom. For an athlete, who is smart, pretty and well-liked, this night that should be the highlight of her high school career. But Emily has a secret. And by the end of the evening, that secret will be silenced forever. Forty years later, Emily’s murder remains a mystery. Her tight-knit group of friends closed ranks; her respected, wealthy family retreated inwards; the small town moved on from her grisly attack. But all that’s about to change.

Everyone from Wakarusa, Indiana, remembers the infamous case of January Jacobs, who was discovered in a ditch hours after her family awoke to find her gone. Margot Davies was six at the time, the same age as January—and they were next-door neighbors. In the twenty years since, Margot has grown up, moved away, and become a big-city journalist. But she’s always been haunted by the feeling that it could’ve been her. And the worst part is, January’s killer has never been brought to justice.