It's been one year since the brutal murder of her older sister, Zoë, and fifteen-year-old Echo is still reeling from the aftermath. Her parents are numb, her friends are moving on, and the awkward start to her freshman year proves she'll never live up to her sister's memory. Until Zoë's former boyfriend Marc shows up with Zoë's diary. At first Echo's not interested, doubting there's anything in there she doesn't already know. But when curiosity prevails, she starts reading, becoming so immersed in her sister's secret world, their lives begin to blur.

Being the new girl is tough—just ask sixteen-year-old Rio Jones. A New York transplant, Rio has no clue how she's going to fit in at her fancy new private school in Southern California. Plus, being late, overdressed, and named after a Duran Duran song doesn't make the first day any easier for her. Then Rio meets Kristi. Beautiful, rich, and a cheerleader, Kristi is the queen bee of Newport Beach. And Kristi isn't friends with just anyone, so Rio is thrilled when she's invited to be part of the most exclusive, popular clique.

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.

Sixteen-year-old Lara Jean Song keeps her love letters in a hatbox her mother gave her. They aren’t love letters that anyone else wrote for her; these are ones she’s written. One for every boy she’s ever loved - five in all. When she writes, she pours out her heart and soul and says all the things she would never say in real life, because her letters are for her eyes only. Until the day her secret letters are mailed, and suddenly, Lara Jean’s love life goes from imaginary to out of control.

You know, being friends with two cute boys does have its benefits. There's Danny. Danny is a golden boy in every way. He has dreamy blue eyes and blonde hair that always looks perfect, even when it's windblown or been stuck under a football helmet. He's the boy every girl crushes on. The boy I get into trouble with, the boy I fight with, the hot quarterback no girl can resist, not even me. Being with Danny is like being on an adventure. He has a bright, contagious smile and abs to die for. He's pretty much irresistible.

Fifteen-year-old Rae Maddox’s mom, Gina, is a big fan of fresh starts. Gina thinks of them as an adventure, but for Rae, each move is just one more friend lost, one more chance to feel like an outsider. After arriving in Wisconsin, Gina promises to stay put until Rae graduates. Cautiously optimistic, she wades into the social whirl at Whitman High School, making a few friends and even earning a chance at love. But when the vice principal pairs her with fellow newbie Allison Daly, Rae’s tentative happiness is jeopardized.

Sarah Martin had every intention of skipping her high school reunion. Once a popular girl and valedictorian, she's now pushing forty, divorced, and running a small bookstore in Nashville - not exactly an impressive life. But Sarah's best friend, Kristen, won't take no for an answer, and she won't let them return to Briley High without Roxanne, the missing third in their senior-high trio.

When Jade is given a scholarship to an elite private college in Connecticut, she sees it as a chance to finally escape her painful past and get a fresh start. She’s determined to succeed and that means keeping her focus on school and not guys. But that plan falls apart her first day on campus when Garret, a wealthy prep school boy with swimmer abs and a perfect smile, offers to help her move in. Jade tries to push him away but she can’t deny her attraction to him and Garret won’t let her.

Sixteen-year-old Sana Kiyohara has too many secrets. Some are small, like how it bothers her when her friends don't invite her to parties. Some are big, like the fact that her father may be having an affair. And then there's the one that she can barely even admit to herself - the one about how she might have a crush on her best friend. When Sana and her family move to California, she begins to wonder if it's finally time for some honesty, especially after she meets Jamie Ramirez.

Everyone knows Alice slept with two guys at one party. When Healy High star quarterback Brandon Fitzsimmons dies in a car crash, it was because he was sexting with Alice. Ask anybody. Rumor has it Alice Franklin is a slut. It's written all over the "slut stall" in the girls' bathroom: "Alice had sex in exchange for math test answers" and "Alice got an abortion last semester." After Brandon dies, the rumors start to spiral out of control.

Judy Lohden is your above-average 16-year-old: sarcastic and vulnerable, talented and uncertain, full of big dreams for a big future. With a singing voice that can shake an auditorium, she should be the star of Darcy Arts Academy, the local performing-arts high school. So why is a girl this promising hiding out in a seedy motel room on the edge of town?

Astrid Jones desperately wants to confide in someone, but her mother's pushiness and her father's lack of interest tell her they're the last people she can trust. Instead, Astrid spends hours lying on the backyard picnic table watching airplanes fly overhead. She doesn't know the passengers inside, but they're the only people who won't judge her when she asks them her most personal questions...like what it means that she's falling in love with a girl.

Postcard-perfect Jar Island is home to charming tourist shops, pristine beaches, amazing oceanfront homes - and three girls secretly plotting revenge. KAT is sick and tired of being bullied by her former best friend. LILLIA has always looked out for her little sister, so when she discovers that one of her guy friends has been secretly hooking up with her, she’s going to put a stop to it. MARY is perpetually haunted by a traumatic event from years past, and the boy who’s responsible has yet to get what’s coming to him. None of the girls can act on their revenge fantasies alone without being suspected. But together…anything is possible .

When Jenny Shaw hears someone shout "Jessie!" across a hotel lobby, she impulsively answers. All her life, Jenny has toed the line, but something propels her to seize the opportunity to become Jessie Morgan, a woman to whom she bears an uncanny resemblance. Lonely in her own life, Jenny is embraced by Jessie’s warm circle of friends - and finds unexpected romance. But when she delves into Jessie’s past, Jenny discovers a secret that spurs her to take another leap into the unknown.

What's it like to be undocumented? High school senior M.T. knows all too well. With graduation and an uncertain future looming, she must figure out how to grow up in the only country she's ever called home... a country in which she's "illegal". M.T. was born in Argentina and brought to America as a baby without any official papers. And as questions of college, work, and the future arise, M.T. will have to decide what exactly she wants for herself, knowing someone she loves will unavoidably pay the price for it.