Millions are fans of Diana Gabaldon's popular Outlander books and television series, but few know that Gabaldon's fictional Castle Leoch was inspired by a real Scottish castle, Castle Leod. The two sisters who lived there at the turn of the 20th century were among the most fascinating and talked-about women of their era.

Dr. Emory Charbonneau, a pediatrician and marathon runner, disappears on a mountain road in North Carolina. By the time her husband Jeff, miffed over a recent argument, reports her missing, the trail has grown cold. Literally. Fog and ice encapsulate the mountainous wilderness and paralyze the search for her. While police suspect Jeff of "instant divorce," Emory, suffering from an unexplained head injury, regains consciousness and finds herself the captive of a man whose violent past is so dark that he won't even tell her his name.

1867, Richmond, Virginia: Though she wears the same low-cut purple gown that is the uniform of all the girls who work at Worsham's gambling parlor, Arabella stands apart. It's not merely her statuesque beauty and practiced charm. Even at seventeen, Arabella possesses an unyielding grit, and a resolve to escape her background of struggle and poverty. Collis Huntington, railroad baron and self-made multimillionaire, is drawn to Arabella from their first meeting. Collis is married and 30 years her senior, yet they are well-matched in temperament, and flirtation rapidly escalates into an affair.

Every family has secrets, and on the hottest day of the year, the truth is about to come out. As a tragedy unfolds behind closed doors, the dawn chorus is split by the wail of sirens. And one by one the families who tried so hard to welcome the Wests begin to realise: Hogarth Street will never be the same again.

Mia, the irreverent, hyperanalytical twenty-year-old daughter, has an explanation for everything—which is why she isn’t initially concerned when her father and younger brother Eugene don’t return from a walk in a nearby park. They must have lost their phone. Or stopped for an errand somewhere. But by the time Mia’s brother runs through the front door bloody and alone, it becomes clear that the father in this tight-knit family is missing and the only witness is Eugene, who has the rare genetic condition Angelman syndrome and cannot speak.

As an emergency room doctor, 41-year-old Hadley Moore has spent a decade perfecting the art of shutting down her emotions to focus on saving lives. But when her younger sister and brother-in-law die tragically, the pain of loss is too great to ignore. Reeling from guilt over letting her family take a back seat to her career, Hadley seizes the opportunity to make things right by returning to her hometown to raise the infant son her sister left behind.

Clinical psychologist Camille Brooks isn't put off by the lifestyle of her hoarder clients and the distress of their families. She lost her mother to the crippling anxiety disorder - so she'll go a long way to help others avoid the same pain. Despite Camille's expertise, her growing audience for her Let In the Light podcast, and the recognition she's gaining for her creative coaching methods, she's not prepared for the pushback. A client who looks uncannily like her mom catches her off guard and raises long-dormant issues.

A mysterious letter alluding to a secret in her parents' past brings Genevieve Woodward back to her Blue Ridge Mountains hometown, but she's also in need of a break from a high-profile career that has left her dangerously burned out and concealing a powerful secret of her own. When she wakes inside an unfamiliar cottage to find the confused owner staring down at her, she can no longer ignore the fact that she needs help.

Celia Burrows thought she had it all - a handsome husband, two successful children, and a gorgeous beach house on the northern coast of Maine. But her perfect life cracks apart when her husband of 30 years informs her that he's leaving. In a note. And since problems come in threes, her adult children reveal they've both been struggling with issues of their own.

Brianna is the youngest of the three Porter sisters and the only one who chose to stay in the small town of Splendid Lake, North Carolina. She followed in her father’s footsteps and became an expert boat mechanic, helping him run their small resort with cabin rentals, a convenience store, and a marina. When Brianna’s father unexpectedly dies, Brianna is steeped in grief and guilt - and left alone to clean up the mess. To make matters worse, a constant stream of real estate brokers begin marching through her property, pressuring her to sell off the family land.

Margaret, the matriarch of the wealthy Jamieson family, has always been as tight-fisted with the family money as she is with her affection. Her daughter, Sarah, is successful in her own right, but she feels compelled to meet Margaret's every demand. Anita, married to Cameron Jamieson, leads a comfortable life, but she fears everything could change in a heartbeat. Ellie, the youngest, has lived a nomadic life, leaving her siblings to care for their ageing mother. As their mother’s health deteriorates, will long-held secrets and childhood rivalries smash this family into pieces?

Sisters Amanda Foster and Erin Turner have little in common except the childhood bedroom they once shared and the certainty each feels that her way of life is best. Amanda follows the rules - at the school where she works; in her community; and as a picture-perfect daughter, wife, and mother-to-be. Erin follows her heart - in love and otherwise - living a bohemian lifestyle on a shoestring budget and honoring her late father’s memory with a passion for music and her fledgling bath-products business.

Newlywed Jade Westmore has finally found her forever in husband Wells, a charming, successful, and recently divorced architect—only there’s one caveat: behind the gates of their elysian estate, hidden from street view in the caretaker’s cottage … lives Wells’s first wife, Sylvie. Three years ago, the original Mrs. Westmore suffered a nervous breakdown—and hasn’t uttered a sound since. Not a physician, psychologist, or world-renown specialist has been able to elicit so much as a word from the silent woman … until now.

Priscilla Martin. She’s the diva of Morning Glory Circle, and a driving force in the quaint California town of Snapdragon. Overseer of garage sales and neighborhood Christmas decorations, she is widely admired. But few people know the real woman behind the perfectly coiffed hair and Opium perfume.

Early into the tempestuous decade of her thirties, Rae Langdon struggles to work through a grief she never anticipated. With her father, Connor, she tends to their Ohio farm, a forty-acre spread that itself has enjoyed better days. As memories sweep through her, some too precious to bear, Rae gives shelter from a brutal winter to a teenager named Quinn Galecki.