Twelve years ago, Paige Fischer's identical twin, Jessica was kidnapped. Blaming herself, Paige never gave up hoping Jess is still alive, despite everyone else in her life insisting it's time to move on. Jamie is the perfect partner, and father to their son, but when he asks Paige to set a date for their wedding, she tells him she can't, not until her sister is found. Every step forward Paige takes with her life feels like a betrayal to Jess and until Paige knows for sure what happened to her, she can't settle down.

She was on cloud nine after accepting an offer of a lifetime. A simpler life than what she was accustomed to. What could go wrong? 

Elle is a survivor. She’s managed to piece together a solid life from a childhood of broken memories and fairy tales her mom told her to explain away bad dreams. But weekly visits to her mother still fill Elle with a paralyzing fear she can’t explain. It’s just another of so many unanswered questions she grew up with in a family estranged by silence and secrets.

Emma loves her life. She’s the mother of a precocious kindergartner, married to her soul mate - a loyal and loving police detective - and has a rewarding career as a doctor at the local hospital. But everything comes crashing down when her son, Josh, is diagnosed with a rare cancer. Determined to save him, Emma decides to sell opioids to fund the life-saving treatment he needs. But when somebody ends up dead, a lethal game of cat and mouse ensues, her own husband leading the chase. With her son’s life in the balance, Emma's dragged into the dark world of drugs, lies, and murder.

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. Then the nanny disappears. 

Best friends Lindsey, Kendra, and Dani endure every parent’s nightmare when a tragic accident befalls their teenage boys, leaving one dead, another in a coma, and a third too traumatized to speak. Reeling from the worst night of their lives, the three mothers plunge into a desperate investigation of the bizarre incident. How could something so horrible happen in their wealthy Southern California suburb? They soon discover that the accident was just the beginning, and troubling discoveries lead to chilling questions: Do they really know their children? Do they even know each other?

Life is over in an instant for sixteen-year-old Finn Miller when a devastating car accident tumbles her and ten others over the side of a mountain. Suspended between worlds, she watches helplessly as those she loves struggle to survive. Impossible choices are made, decisions that leave the survivors tormented with grief and regret. Unable to let go, Finn keeps vigil as they struggle to reclaim their shattered lives. 

Mark and Melissa Cain are thrilled to have found Jade, a babysitter who is brilliant with their young children. Having seen her own house burn to the ground, Jade needs them as much as they need her. Moving Jade into the family home can only be a good thing, can’t it? As Mark works long hours as a police officer and Melissa struggles with running a business, the family become ever more reliant on their babysitter, who is only too happy to help. And as Melissa begins to slip into depression, it’s Jade who is left picking up the pieces. But Mark soon notices things aren’t quite as they seem. Things at home feel wrong, and as Mark begins to investigate their seemingly perfect sitter, what he discovers shocks him to his core. He’s met Jade before. And now he suspects he might know what she wants.

It's Livia's 40th birthday, and her husband, Adam, is throwing her the party of a lifetime to make up for the wedding they never had. Everyone she loves will be there, except her daughter, Marnie, who's studying abroad. But Livia is secretly glad Marnie won't be there. Livia has recently uncovered a secret about their daughter that, if revealed, will shake the foundation of their family to its core. She needs to tell Adam, but she's waiting until the party is over so they can have this last happy time together.

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.