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.

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.

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.

Lauren Adelman and her high school sweetheart, Rory Kincaid, are a golden couple. They marry just out of college as Rory, a star hockey player, earns a spot in the NHL. Their future could not look brighter when Rory shocks everyone - Lauren most of all - by enlisting in the US Army. When Rory dies in combat, Lauren is left devastated, alone, and under unbearable public scrutiny.

Esme Nash is eager to leave her small town and begin her carefully planned post-grad life: a move to New York City, an apartment with her loving college boyfriend, and a fancy job at an art gallery. But when tragedy strikes, instead of heading to Manhattan, she returns home to care for her ailing father, leaving every bit of her dream behind.

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.

For Sewanee Chester, being an audiobook narrator is a long way from her old dreams, but the days of being a star on film sets are long behind her. She’s found success and satisfaction from the inside of a sound booth and it allows her to care for her beloved, ailing grandmother. When she arrives in Las Vegas last-minute for a book convention, Sewanee unexpectedly spends a whirlwind night with a charming stranger.

Nora Hamilton knows the formula for love better than anyone. As a romance channel screenwriter, it’s her job. But when her too-good-to work husband leaves her and their two kids, Nora turns her marriage’s collapse into cash and writes the best script of her life. No one is more surprised than her when it’s picked up for the big screen and set to film on location at her 100-year-old-home. When former Sexiest Man Alive, Leo Vance, is cast as her ne’er do well husband Nora’s life will never be the same.

Smarting from her recently canceled wedding and about to turn forty, Laurie Sassalyn returns to her Maine hometown of Calcasset to handle the estate of her great-aunt Dot, a spirited adventurer who lived to be ninety-three. Alongside boxes of Polaroids and pottery, a mysterious wooden duck shows up at the bottom of a cedar chest. Laurie’s curiosity is piqued, especially after she finds a love letter to the never-married Dot that ends with the line “And anyway, if you’re ever desperate, there are always ducks, darling.”

The Kingsley family is American royalty, beloved for their military heroics, political service, and unmatched elegance. In 1967, after Joseph S. Kingsley, Jr. is killed in a tragic accident, his charismatic son inherits the weight of that legacy. But Joe III is a free spirit—and a little bit reckless. Despite his best intentions, he has trouble meeting the expectations of a nation, as well as those of his exacting mother, Dottie.

Carrie Soto is fierce, and her determination to win at any cost has not made her popular. But by the time she retires from tennis, she is the best player the world has ever seen. She has shattered every record and claimed twenty Grand Slam titles. And if you ask Carrie, she is entitled to every one. She sacrificed nearly everything to become the best, with her father, Javier, as her coach. A former champion himself, Javier has trained her since the age of two.

Nisha Cantor lives the globetrotting life of the seriously wealthy, until her husband announces a divorce and cuts her off. Nisha is determined to hang onto her glamorous life. But in the meantime, she must scramble to cope--she doesn’t even have the shoes she was, until a moment ago, standing in. That’s because Sam Kemp—in the bleakest point of her life—has accidentally taken Nisha’s gym bag. But Sam hardly has time to worry about a lost gym bag—she’s struggling to keep herself and her family afloat.

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.