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.

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?

Naomi wasn’t just running away from her wedding. She was riding to the rescue of her twin. Too bad for Naomi, her evil twin hasn’t changed at all. After helping herself to Naomi’s car and cash, Tina leaves her with a niece she didn’t know she had. Now, she’s stuck in town with no car, no job, no home - and an 11-year-old to take care of. Since Naomi’s life imploded right in front of him, the least Knox can do is help her out. And just as soon as she's out of trouble, he can get back to his peaceful, solitary life. That’s the plan, until the trouble turns to real danger.

Poppy and Alex. Alex and Poppy. They have nothing in common. She’s a wild child; he wears khakis. She has insatiable wanderlust; he prefers to stay home with a book. And somehow, ever since a fateful car share home from college many years ago, they are the very best of friends. For most of the year they live far apart—she’s in New York City, and he’s in their small hometown—but every summer, for a decade, they have taken one glorious week of vacation together.

Celebrating her forty-fifth birthday at her local pub, popular podcaster Alix Summer crosses paths with an unassuming woman called Josie Fair. Josie, it turns out, is also celebrating her forty-fifth birthday. They are, in fact, birthday twins. A few days later, Alix and Josie bump into each other again, this time outside Alix’s children’s school. Josie has been listening to Alix’s podcasts and thinks she might be an interesting subject for her series. She is, she tells Alix, on the cusp of great changes in her life.

Macy Sorensen is settling into an ambitious if emotionally tepid routine: work hard as a new pediatrics resident, plan her wedding to an older, financially secure man, keep her head down and heart tucked away. But when she runs into Elliot Petropoulos - the first and only love of her life - the careful bubble she’s constructed begins to dissolve.

Sasha has had it. She cannot bring herself to respond to another inane, “urgent” email or participate in the corporate employee joyfulness program. She hasn’t seen her friends in months. Sex? Seems like a lot of effort. Even cooking dinner takes far too much planning. Sasha has hit a wall. Armed with good intentions to drink kale smoothies, try yoga, and find peace, she heads to the seaside resort she loved as a child. But it’s the off season, the hotel is in a dilapidated shambles, and she has to share the beach with the only other occupant: a grumpy guy named Finn.

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.

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.

Nora Stephens' life is books—she’s read them all—and she is not that type of heroine. Not the plucky one, not the laidback dream girl, and especially not the sweetheart. In fact, the only people Nora is a heroine for are her clients, for whom she lands enormous deals as a cutthroat literary agent, and her beloved little sister Libby. Which is why she agrees to go to Sunshine Falls, North Carolina, for the month of August when Libby begs her for a sisters’ trip away.

Sloan will go through hell and back for those she loves. And she does so, every single day. Caught up with the alluring Asa Jackson, a notorious drug trafficker, Sloan has finally found a lifeline to cling to, even if it’s meant compromising her morals. She was in dire straits trying to pay for her brother’s care until she met Asa. But as Sloan became emotionally and economically reliant on him, he in turn developed a disturbing obsession with her—one that becomes increasingly dangerous every day.

Belly measures her life in summers. Everything good, everything magical happens between the months of June and August. Winters are simply a time to count the weeks until the next summer, a place away from the beach house, away from Susannah, and most importantly, away from Jeremiah and Conrad. They are the boys that Belly has known since her very first summer—they have been her brother figures, her crushes, and everything in between. But one summer, one wonderful and terrible summer, the more everything changes, the more it all ends up just the way it should have been all along.

Olive Torres is used to being the unlucky twin: from inexplicable mishaps to a recent layoff, her life seems to be almost comically jinxed. By contrast, her sister Ami is an eternal champion...she even managed to finance her entire wedding by winning a slew of contests. Unfortunately for Olive, the only thing worse than constant bad luck is having to spend the wedding day with the best man (and her nemesis), Ethan Thomas.

As a third-year PhD candidate, Olive Smith doesn't believe in lasting romantic relationships—but her best friend does, and that's what got her into this situation. Convincing Anh that Olive is dating and well on her way to a happily ever after was always going to take more than hand-wavy Jedi mind tricks: Scientists require proof. So, like any self-respecting biologist, Olive panics and kisses the first man she sees.