Marin Bishop has always played by the rules, and it's paid off: On the cusp of 30, she has a handsome fiancé, a prestigious Manhattan legal career, and her father's hard-won admiration. But with one careless mistake at work, Marin suddenly finds herself unemployed and alone. Before she can summon the courage to tell her parents, a young woman appears, claiming to be Marin's half sister. Seeking answers, Marin agrees to join her on a soul-searching journey to Cape Cod, to meet the family she didn't even know she had.

Summer has started in idyllic Sag Harbor, and for Emma Mapson that means greeting guests at the front desk of The American Hotel. But when one of the town's most famous residents, artist Henry Wyatt, dies suddenly, Emma learns he has mysteriously left his waterfront home - a self-designed masterpiece filled with his work - to her teenage daughter, Penny. In Manhattan, legendary art patron Bea Winstead's grief at her lifelong friend and former business partner Henry's passing turns to outrage, and she descends on Sag Harbor determined to reclaim the house and preserve Henry's legacy.

For decades, the Hollander Estates winery has been the premier destination for lavish parties and romantic day trips on the North Fork of Long Island. But behind the lush vineyards and majestic estate house, the Hollander family fortunes have suffered and the threat of a sale brings old wounds to the surface. For matriarch Vivian, she fears that this summer season could be their last - and that selling their winery to strangers could expose a dark secret she's harbored for decades.

Ruth Cooperman arrives in beautiful beachside Provincetown for her retirement, renting the perfect waterfront cottage while she searches for her forever home. After years of hard work and making peace with life's compromises, Ruth is looking forward to a carefree summer of solitude. But when she finds a baby girl abandoned on her doorstep, Ruth turns to her new neighbors for help and is drawn into the drama of the close-knit community. The appearance of the mystery baby has an emotional ripple effect through the women in town.

The Pavlin family built an empire on love. As the first jewelers to sell diamond rings exclusively for proposals, they started a tradition that has defined engagements ever since. But when an ill-fated publicity stunt pits the three Pavlin sisters against one another for a famous family jewel, their bond is broken. No ordinary diamond ring, the Electric Rose splinters the sisters, leaving one unlucky in love, one escaping to the shores of Cape Cod, and the other, ultimately, dead. Now, over a decade later, Gemma Maybrook is still reconciling the reality of her mother's death.

Anna McNichol knows how to take charge. Raised by a single mother, she’s worked to ensure her three children have every advantage she didn’t. And while her marriage has its problems, she values commitment and believes in "till death do us part." Now an empty nester, she’s at the peak of her career and ready to seize the opportunity to focus on her future.

Fresh off a bad breakup with a longtime boyfriend, Nantucket sweetheart Lizbet Keaton is desperately seeking a second act. When she’s named the new general manager of the Hotel Nantucket, a once Gilded Age gem turned abandoned eyesore, she hopes that her local expertise and charismatic staff can win the favor of their new London billionaire owner, Xavier Darling, as well as that of Shelly Carpenter, the wildly popular Instagram tastemaker who can help put them back on the map.

Hollis Shaw, creator of the popular food blog, Hungry with Hollis, is shocked when her heart surgeon husband, Matthew, is killed in a one-car accident on a snowy morning. The cracks in Hollis’s perfect life—her strained marriage and her complicated relationship with her daughter, Caroline—grow deeper. So when Hollis hears about something called a “Five-Star Weekend”—one woman organizes a trip for her best friend from each phase of her life: her teenage years, her twenties, her thirties, and midlife—she decides to host her own Five-Star Weekend on Nantucket.

Louisa has come to her parents’ house in Maine this summer with her three kids, a barely written book that has a looming deadline, and a trunkful of resentment. Louisa is hoping the crisp breeze will blow away her irritation for her life choices and replace it with enthusiasm for both her family and her writing. But all isn’t well in Maine. Louisa’s father, a retired judge and pillar of the community, is suffering from Alzheimer’s. Louisa’s mother is alternately pretending everything is fine and not pretending at all.

High-school sweethearts Mac and Edie Swan lead a seemingly picture-perfect life in the sleepy-sweet community of Oak Hill, near Mobile, Alabama. Edie is a respected interior designer, Mac is a beloved pediatrician, and they have two great kids and a historic home on tree-lined Linden Avenue. From the outside, the Swan family is the definition of “the good life”. And life is good—mostly. Until a young woman walks into Mac’s office one day. A young woman whose very existence threatens all Mac and Edie have built and all they think they know about each other.

It’s summertime on the North Carolina coast and the livin’ is easy. Unless, that is, you’ve just lost your mother to cancer, your sister to her extremist husband, and your husband to his executive assistant. Meet Gray Howard. Right when Gray could use a serious infusion of good karma in her life, she inadvertently gets a stranger, Diana Harrington, fired from her job at the local pharmacy. Diana Harrington’s summer isn’t off to the greatest start either: Hours before losing her job, she broke up with her boyfriend and moved out of their shared house.

Harriet and Wyn have been the perfect couple since they met in college—they go together like salt and pepper, honey and tea, lobster and rolls. Except, now—for reasons they’re still not discussing—they don’t. They broke up five months ago. And still haven’t told their best friends.

Clare Wilson is starting over. She's had it with her marriage to a charming serial cheater. Even her own son thinks she's given his father too many chances. With the support of her sisters, Maggie and Sarah, she's ready to move on. Facing her fortieth birthday, Clare is finally feeling the rush of unadulterated freedom. But when a near-fatal car accident lands Clare in the hospital, her life takes another detour. While recovering, Clare realizes she has the power to choose her life's path. With enthusiasm and a little envy, her sisters watch her bloom.

Lillie Silva knew life as an empty nester would be hard after her only child left for college, but when her husband abruptly dumps her for another woman just as her son leaves, her world comes crashing down. Besides the fact that this announcement is a complete surprise (to say the least), what shocks Lillie most is that she isn't...heartbroken. She's furious. Lillie has loved her life on Cape Cod, but as a mother, wife and nurse-midwife, she's used to caring for other people...not taking care of herself.

Gerri can't decide what's more devastating: learning her rock-solid marriage has big cracks, or the anger she feels as she tries to repair them. Always the anchor for friends and her children, she realizes it's time to look carefully at herself. The journey is more than revealing—it's transforming. Andy has come to believe that a lasting love is out of reach. When she finds herself attracted to a man without any of the qualities that usually appeal to her, she questions everything she thought she wanted in life.