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.

Merritt Coletto and her husband, Luca, have the life they dreamed of: a coastal home, a promising future, and a growing family. That dream ends with a late-night knock on the door. Weak, broken, and emaciated, it’s Luca’s first wife, Lydia. Missing for ten years, presumed dead, and very much alive, she has quite a story. Racked with guilt over the beautiful life they’ve built, Merritt and Luca agree to help get Lydia back on her feet - it’s the least they can do. But the more enmeshed Lydia becomes in Merritt’s family, the more questions Merritt has.

What if the perfect life you envy was rotten to the core? Three brand-new friends. Three very different families. Way too many secrets. Gisela, Sally and Kate become close when they move into the same new housing estate. But behind their shiny front doors, each has something to hide. Three lives collide in this gripping story about friendship, motherhood and marriage and the façade of perfection people present to the world.

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....

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?

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.

Ava only left her daughter in the pushchair for five minutes. The buckle was fastened, and she was sure it was safe. But when she came downstairs, the door was open and Abi was gone - she walked down the road, past the Lovegoods' house, and was never seen again. A year later, the Lovegoods throw a housewarming party, showing off the results of their renovation. Ava doesn’t want to go. She can’t bear to look down that end of the road, to see the place where Abi vanished, and she doesn’t want to spend time with people who don’t share her grief.

Jessie Sloane is on the path to rebuilding her life after years of caring for her ailing mother. She rents a new apartment and applies for college. But when the college informs her that her social security number has raised a red flag, Jessie discovers a shocking detail that causes her to doubt everything she’s ever known. Meanwhile, 20 years earlier and 250 miles away, another woman’s split-second decision may hold the key to Jessie’s secret past. Has Jessie’s whole life been a lie, or have her delusions gotten the best of her?

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.

1990. Toby Dobbs received a big Victorian house with too many bedrooms to count as a wedding present from his father, but his marriage is over within a month. Very alone, and very lonely, Toby posts an advertisement seeking the Unexpectedly Alone to become his roommates. Fifteen years later, the wayward souls he takes in are still living with him, with no intention of leaving. 2004. Toby Dobbs has met Leah Pilgrim from across the road, and they're falling in love.

In a quiet suburban neighborhood, in the house next door, a family is brutally murdered for no apparent reason. You can't help thinking, "That could have been us". And you start to wonder, "What if we're next?" That's the question Jim and Ellen Cutter are asking, and the answers aren't reassuring.

PLAY. Andrew, the manager of Shanamore Cottages, watches his only guest via a hidden camera in her room. One night the unthinkable happens: a shadowy figure emerges on-screen, kills her, and destroys the camera. But who is the murderer? How did they know about the camera? And how will Andrew live with himself? PAUSE. Natalie wishes she'd stayed at home as soon as she arrives in the wintry isolation of Shanamore. There's something creepy about the manager. She wants to leave, but she can't - not until she's found what she's looking for.... REWIND.