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.

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.

Dove "Birdie" Randolph works hard to be the perfect daughter and follow the path her parents have laid out for her: She quit playing her beloved soccer, she keeps her nose buried in textbooks, and she's on track to finish high school at the top of her class. But then Birdie falls hard for Booker, a sweet boy with a troubled past...whom she knows her parents will never approve of. When her estranged aunt, Carlene, returns to Chicago and moves into the family's apartment above their hair salon, Birdie notices the tension building at home.

James and Alex have barely anything in common anymore - least of all their experiences in high school, where James is a popular senior and Alex is suddenly an outcast. But at home, there is Henry, the precocious 10-year-old across the street, who eagerly befriends them both. And when Alex takes up running, there is James’s friend Nathen, who unites the brothers in moving and unexpected ways.

He was perfect. At first. The summer before senior year, 17-year-old Chloe starts an internship at a local newspaper. While on assignment, she meets Kieran, a quirky aspiring actor. Chloe is smitten with Kieran's charisma and his ability to soothe her soul, torn over her parents' impending divorce. As their bond deepens, Kieran becomes smothering and flies into terrifying rages.

Autumn and Finn used to be inseparable. But then something changed. Or they changed. Now, they do their best to ignore each other. Autumn has her boyfriend, Jamie, and her close-knit group of friends. And Finn has become that boy at school, the one everyone wants to be around. That still doesn't stop the way Autumn feels every time she and Finn cross paths, and the growing, nagging thought that maybe things could have been different. Maybe they should be together. But come August, things will change forever.

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.

Sidney and Asher should have clicked. Two star swimmers forced to spend their summers on a lake together sounds like the perfect match. But it's the same every year - in between cookouts and boat rides and family-imposed bonfires, Sidney and Asher spend the dog days of summer finding the ultimate ways to prank each other. And now, after their senior year, they're determined to make it the most epic summer yet.

It’s been 17 years since the tragic summer the McAvoy sisters fell apart. Lindy, the wild one, left home, carved out a new life in the city, and never looked back. Delia, the sister who stayed, became a mother herself, raising her daughters and running the family shop in their small Ohio hometown on the shores of Lake Erie. But now, with their mother’s ailing health and a rebellious teenager to rein in, Delia has no choice but to welcome Lindy home.

Julián Luna has a plan for his life: Graduate. Get into UCLA. And have the chance to move away from Corpus Christi, Texas, and the suffocating expectations of others that have forced Jules into an inauthentic life. Then in one reckless moment, with one impulsive tweet, his plans for a low-key nine months are thrown - literally - out the closet. The downside: the whole world knows, and Jules has to prepare for rejection. The upside: Jules now has the opportunity to be his real self. Then Mat, a cute, empathetic Twitter crush from Los Angeles, slides into Jules’s DMs.

When my mother decided to pull me out of school, I didn’t say anything. When she homeschooled me, isolated me, kept me fearful of my peers, I followed along. When she packed me up and sent me across the country to live with my grandmother in the one-stoplight town of Lee Vines, I did as she said. But now that she’s left me here I’m on my own. I can make my own decisions. Make my own mistakes. And that includes if I let in the four boys that live next door.

2009. Lindsey and Georgie have high hopes for their summer on Martha's Vineyard. In the wake of the recession, ambitious college graduate Lindsey accepts a job as a nanny for an influential family who may help her land a position in Boston's exclusive art world. Georgie, the eldest child in that family, is nearly fifteen and eager to find herself, dreaming of independence and yearning for first love.

Seventeen is nothing like Codi Teller imagined. She’s never crashed a party, never stayed out too late. She’s never even been kissed. And it’s not just because she’s gay. It’s because she and her two best friends, Maritza and JaKory, spend more time in her basement watching Netflix than engaging with the outside world. So when Maritza and JaKory suggest crashing a party, Codi is highly skeptical. Those parties aren’t for kids like them. They’re for cool kids. Straight kids. But then, Codi stumbles upon one of those cool kids, Ricky, kissing another boy.

Sky Baker may be openly gay, but in his small, insular town, making sure he was invisible has always been easier than being himself. Determined not to let anything ruin his senior year, Sky decides to make a splash at his high school’s annual beach bum party by asking his crush, Ali, to prom - and he has thirty days to do it.

Emily and her mom were always lucky. But Emily’s mom’s luck ran out three years ago when she succumbed to cancer, and nothing has felt right for Emily since. Now, the summer before her senior year, things are getting worse. Not only has Emily wrecked things with her boyfriend Matt, who her mom adored, but her dad is selling the house she grew up in and giving her mom’s belongings away. Soon, she’ll have no connections left to Mom but her lucky quarter.