If She Only Knew, introduces the Cahills, a wealthy San Francisco family - rich in money, twisted secrets, and hidden agendas. Now at the center of their tangled world is Marla Cahill - a woman with no memory of who she is, what she’s done, or why she could be the next to die... It begins on a dark stretch of highway. Two vehicles swerve and crash - leaving one woman dead and another in a coma. When the surviving woman awakens, her memory is gone and her face has been reconstructed. Her family tells her that her name is Marla Cahill - but they’re all strangers to her.

Over twenty years ago, the heiress Patricia Lockwood was abducted during a robbery of her family's estate, then locked inside an isolated cabin for months. Patricia escaped, but so did her captors - and the items stolen from her family were never recovered. Until now. On the Upper West Side, a recluse is found murdered in his penthouse apartment, alongside two objects of note: a stolen Vermeer painting and a leather suitcase bearing the initials WHL3. For the first time in years, the authorities have a lead - with the suitcase and painting both pointing them toward one man.

When she was 9 years old, Melody Browne's house burned down, and it took all of her childhood memories with it. Now she's a single mother of a teenage boy living in Central London. She hasn't seen her parents since she left home at 15, but she doesn't mind. She's better off on her own. She works as a dinner lady at her son's school and has no idea where her humdrum life is heading. But one summer's night, a hypnotist inadvertently unlocks memories of her childhood, and her whole life is turned upside down.

Brothers Tony, Sean, and Ned had the perfect upbringing, but now that they are grown-up, real life is starting to get in the way. Tony’s dealing with divorce and a weight problem, novelist Sean is up against a serious case of writer’s block and a shock announcement from his “perfect” new girlfriend, and their parents have a new lodger, Gervase. Why is Bernie, their mother, so keen to give this unsavory waif a home? And what is the real reason for kid brother Ned’s surprise return from his travels in Australia?

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.

Shy and gawky, Ana has always daydreamed about living the life of her exotic half-sister Bee, a pop singer who had a number one hit single before she inexplicably vanished from the celebrity scene. When Bee turns up dead, Ana is dispatched to the big city to clear out her apartment. Instantly seduced by the second-hand glamour of Bee's baubles, bangles, and bottles of Pierre-Jouet, Ana takes up with Bee's wild club-hopping cronies.

Imagine that you live on a picturesque communal garden square, an oasis in urban London where your children run free, in and out of other people's houses. You've known your neighbors for years and you trust them. Implicitly. You think your children are safe. But are they really? On a midsummer night, as a festive neighborhood party is taking place, preteen Pip discovers her 13-year-old sister Grace lying unconscious and bloody in a hidden corner of a lush rose garden. What really happened to her?

Three years ago Toni's five-year-old daughter, Evie, disappeared after leaving school. The police have never been able to find her. There were no witnesses, no CCTV, no trace. But Toni believes her daughter is alive. And as she begins to silently piece together her memories, the full story of the past begins to reveal itself - and a devastating truth. Toni's mind is trapped in a world of silence. Her only chance to save herself is to manage the impossible: she must find a way to make herself heard. She must find her daughter.

Melville Heights is one of the nicest neighborhoods in Bristol, England. It’s the sort of place where doctors and lawyers and old-money academics live. It’s not the sort of place where people get stabbed in the back 30 times with a kitchen knife in their own homes. Someone must have seen something. Newlywed Joey Mullen, for example, recently returned from four years of working in Ibiza. She and her husband, Alfie, are eager to find a place of their own in her hometown. But Joey finds herself distracted by the man next door, Tom Fitzwilliam.

Years after an Easter weekend tragedy devastates a family, they return to the house they grew up in to unearth the many secrets hidden within the nooks and crannies of home.

Owen Pick’s life is falling apart. In his 30s and living in his aunt’s spare bedroom, he has just been suspended from his job as a teacher after accusations of sexual misconduct - accusations he strongly denies. Searching for professional advice online, he is inadvertently sucked into the dark world of incel forums, where he meets a charismatic and mysterious figure. Across the street from Owen lives the Fours family, headed by mom Cate, a physiotherapist, and dad Roan, a child psychologist. But the Fours family have a bad feeling about their neighbor Owen.

Ever wondered what happened to your first love? Imagine bumping into them 12 years later and realizing you still fancy them rotten. That's exactly what happens to Dig Ryan when he sees Delilah again. Now imagine you're Nadine. You and Dig have been best friends for 15 years. And you've finally realized that you're in love with him. So when Delilah - who was always your nemesis - returns, you're mad with jealousy and can't help behaving childishly....

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.

After her grandmother Arlette's death, Betty is finally ready to begin her life. She had forfeited university, parties, boyfriends, summer jobs in order to care for Arlette. Now she's ready for whatever life throws at her, and, since the will included a beneficiary unknown to her who lives in the city, she heads there to find the mysterious woman. In 1920s London, Arlette is starting her new life in a time of postwar change. Beautiful and charismatic, she's drawn into a hedonistic world, but then tragedy strikes, and she flees back to her childhood home....

In a windswept British seaside town, single mum Alice Lake finds a man sitting on the beach outside her house. He has no name and no idea how he got there. Against her better judgment, she invites him inside. Meanwhile, in a suburb of London, 21-year-old Lily Monrose has been married for only three weeks. When her husband fails to come home from work one night, she is left alone in a place where she knows no one and with the police telling her that her husband never existed.