Welcome to the most tumultuous summer of the 20th century. It's 1969, and for the Levin family, the times they are a-changing. Every year, the children have looked forward to spending the summer at their grandmother's historic home in downtown Nantucket. But like so much else in America, nothing is the same.

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.

Former Army brat Morgan Albright has finally planted roots in a friendly neighborhood near Baltimore. Her friend and roommate Nina helps her make the mortgage payments, as does Morgan's job as a bartender. But after she and Nina host their first dinner party—attended by Luke, the flirtatious IT guy who'd been chatting her up at the bar—her carefully built world is shattered. The back door glass is broken, cash and jewelry are missing, her car is gone, and Nina lies dead on the floor.

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.

Ever since she got pregnant freshman year, Emoni Santiago’s life has been about making the tough decisions - doing what has to be done for her daughter and her abuela. The one place she can let all that go is in the kitchen, where she adds a little something magical to everything she cooks, turning her food into straight-up goodness. Even though she dreams of working as a chef after she graduates, Emoni knows that it’s not worth her time to pursue the impossible. Yet despite the rules she thinks she has to play by, once Emoni starts cooking, her only choice is to let her talent break free.

Caitlyn Sullivan had come from a long line of Hollywood royalty, stretching back to her Irish immigrant great-grandfather. At nine, she was already a star - yet still an innocent child who loved to play hide-and-seek with her cousins at the family home in Big Sur. It was during one of those games that she disappeared. Some may have considered her a pampered princess, but Cate was in fact a smart, scrappy fighter, and she managed to escape her abductors. Callan Cooper was shocked to find the bloodied, exhausted girl huddled in his house.

When Mallory Blessing's son, Link, receives deathbed instructions from his mother to call a number on a slip of paper in her desk drawer, he's not sure what to expect. But he certainly does not expect Jake McCloud to answer. It's the late spring of 2020 and Jake's wife, Ursula DeGournsey, is the frontrunner in the upcoming Presidential election. There must be a mistake, Link thinks. How do Mallory and Jake know each other?

Blindsided by her mother’s sudden death and wrecked by a recent love affair, Casey Peabody has arrived in Massachusetts in the summer of 1997 without a plan. Her mail consists of wedding invitations and final notices from debt collectors. A former child golf prodigy, she now waits tables in Harvard Square and rents a tiny, moldy room at the side of a garage where she works on the novel she has been writing for six years. At 31, Casey is still clutching onto something nearly all her old friends have let go of: the determination to live a creative life.

Celebrity chef Deacon Thorpe has always been a force of nature with an insatiable appetite for life. But after that appetite contributes to Deacon's shocking death in his favorite place on earth, a ramshackle Nantucket summer cottage, his (messy, complicated) family is reeling. Now Deacon's three wives, his children, and his best friend gather on the island he loved to say farewell.

Daisy Shoemaker can’t sleep. With a thriving cooking business, full schedule of volunteer work, and a beautiful home in the Philadelphia suburbs, she should be content. But her teenage daughter can be a handful, her husband can be distant, her work can feel trivial, and she has lots of acquaintances, but no real friends. Still, Daisy knows she’s got it good. So why is she up all night?

Thirty years ago, Amelia Vaux Tanner and her husband built a house high on the bluffs, a cottage they named Chateau Laveau. For decades, “Ama” played host to American presidents, Wall Street titans, and cultural icons. But her favorite guests have always been her three “goddaughters”: Esperanza “Perry” Soto, a beautiful, talented Afro-Latina lawyer with Ama’s strong, yet guarded personality; Olivia Jones, a gifted Wall Street analyst with Ama’s brilliant, logical mind; and Billie Hayden, a gifted marine biologist and rule-breaker with Ama’s courageous free spirit.

Minnie Cooper knows two things with certainty: that her New Year's birthday is unlucky, and that it's all because of Quinn Hamilton, a man she's never met. Their mothers gave birth to them at the same hospital just after midnight on New Year's Day, but Quinn was given the cash prize for being the first baby born in London in 1990 - and the name Minnie was meant to have, as well. With luck like that, it's no wonder each of her birthdays has been more of a disaster than the one before.

Meredith Martin Delinn just lost everything: Her friends, her homes, her social standing - because her husband Freddy cheated rich investors out of billions of dollars. Desperate and facing homelessness, Meredith receives a call from her old best friend, Constance Flute. Connie's had recent worries of her own, and the two depart for a summer on Nantucket in an attempt to heal. But the island can't offer complete escape, and they're plagued by new and old troubles alike.

Adrienne Dealey has spent the past six years working for hotels in exotic resort towns. This summer she has decided to make Nantucket home. Left flat broke by her ex-boyfriend, she is desperate to earn some fast money. When the desirable Thatcher Smith, owner of Nantucket's hottest restaurant, is the only one to offer her a job, she wonders if she can get by with no restaurant experience. Thatcher gives Adrienne a crash course in the business...and they share an instant attraction.

It's 1947. War's over, cherry-print dresses, parking above the city lights, swing dancing. Beautiful, 17-year-old Violet lives in a perfect world. Everybody loves her. In 2012, she's still beautiful, charming, and surrounded by admirers. Veronica "Ronni" Johnson, licensed practical nurse and aspiring writer, meets the captivating Violet in the assisted living facility where Violet requires no assistance, just lots of male attention. When she dies, she leaves Ronni a very generous bequest - only if Ronni completes a book about her life within one year.