Jen Weinstein and Lauren Parker rule the town of Salcombe, Fire Island every summer. They hold sway on the beach and the tennis court, and are adept at manipulating people to get what they want. Their husbands, Sam and Jason, have summered together on the island since childhood, despite lifelong grudges and numerous secrets. Their one single friend, Rachel Woolf, is looking to meet her match, whether he’s the tennis pro. But even with plenty to gossip about, this season starts out as quietly as any other. Until a body is discovered, face down, off the side of the boardwalk.

At age ninety-two, Tish Darling is the matriarch and protector of what’s left of the Darling family fortune, including the decades-old beach house, Riptide. Located on the crook of Cape Cod, it’s a place she once loved but has not returned to in decades, since a tragic family accident one perfect summer day. Still, she is determined to keep Riptide in the family. Even if that means going back there on the cusp of her granddaughter’s wedding. Even if it means revealing someone else’s truth.

Truth: Sherri Griffin and her daughter, Katie, recently moved to the idyllic beach town of Newburyport, Massachusetts. They’ve been welcomed by Rebecca Coleman, unofficial former leader of the Newburyport Mom Squad, and her teenage daughter Alexa, Katie’s new babysitter. Truth: Alexa has time on her hands after a falling-out with her friends involving her popular YouTube channel.

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.

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.

If Avery Chambers can’t fix you in 10 sessions, she won’t take you on as a client. Her successes are phenomenal—she helps people overcome everything from domineering parents to assault—and almost absorbs the emptiness she sometimes feels since her husband’s death. Marissa and Mathew Bishop seem like the golden couple—until Marissa cheats. She wants to repair things, both because she loves her husband and for the sake of their eight-year-old son. After a friend forwards an article about Avery, Marissa takes a chance on this maverick therapist.

Jess needs a fresh start. She’s broke and alone, and she’s just left her job under less than ideal circumstances. Her half-brother Ben didn’t sound thrilled when she asked if she could crash with him for a bit, but he didn’t say no, and surely everything will look better from Paris. Only when she shows up – to find a very nice apartment, could Ben really have afforded this? – he’s not there.

The very moment that Raina Wingate learns her husband of sixteen years wants to separate, she gets a call that her father has suffered a stroke. Racing to her family’s home on Amelia Island, Florida, Raina hopes the time apart will heal her cracked marriage and that she can step into her father’s real estate business and keep it running. Her sister, Tori, a divorcee who owns a catering business in Boston, also flies in to join the others at the hospital. But an unexpected run-in with their father’s rather attractive neurologist adds a new dimension to the days and weeks ahead.

They say you can never go home again, and for Persephone Fraser, ever since she made the biggest mistake of her life a decade ago, that has felt too true. Instead of glittering summers on the lakeshore of her childhood, she spends them in a stylish apartment in the city, going out with friends, and keeping everyone a safe distance from her heart. Until she receives the call that sends her racing back to Barry’s Bay and into the orbit of Sam Florek—the man she never thought she’d have to live without.

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. Which is how they find themselves sharing a bedroom at the Maine cottage that has been their friend group’s yearly getaway for the last decade.

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.

Fern Brookbanks has wasted far too much of her adult life thinking about Will Baxter. She spent just twenty-four hours in her early twenties with the aggravatingly attractive, idealistic artist, a chance encounter that spiraled into a daylong adventure in the city. The timing was wrong, but their connection was undeniable: they shared every secret, every dream, and made a pact to meet one year later. Fern showed up. Will didn’t.

Sam’s life is on track. She has the perfect doctor fiancé, Jack (his strict routines are a good thing, really), a great job in Manhattan (unless they fire her), and is about to tour a wedding venue near her family’s Long Island beach house. Everything should go to plan, yet the minute she arrives, Sam senses something is off. Wyatt is here. Her Wyatt. But there’s no reason for a thirty-year-old engaged woman to feel panicked around the guy who broke her heart when she was seventeen. Right?

On a perfect June day, Vivian Howe, author of 13 beach novels and mother of three nearly grown children, is killed in a hit-and-run car accident while jogging near her home on Nantucket. She ascends to the Beyond where she's assigned to a Person named Martha, who allows Vivi to watch what happens below for one last summer. Vivi also is granted three “nudges” to change the outcome of events on earth.

In a sleepy seaside town in Maine, recently widowed Eveleth "Evvie" Drake rarely leaves her large, painfully empty house nearly a year after her husband’s death in a car crash. Everyone in town, even her best friend, Andy, thinks grief keeps her locked inside, and Evvie doesn’t correct them. Meanwhile, in New York City, Dean Tenney, former Major League pitcher and Andy’s childhood best friend, is wrestling with what miserable athletes living out their worst nightmares call the "yips": he can’t throw straight anymore, and, even worse, he can’t figure out why.