Inertia, force, mass, gravity, velocity, acceleration...cause and effect. Liz Emerson doesn't understand any of it. But I do. I understand how we fall. Where we fall. Why we fall. I understand her sadness and loneliness and silence, her shattered heart. It doesn't have to bethis way, does it? It wasn't always this way, was it? Stay alive, Liz Emerson, stay alive.

Autumn always knew exactly who she was: a talented artist and a loyal friend. Shay was defined by two things: her bond with her twin sister, Sasha, and her love of music. And Logan has always turned to writing love songs when his real love life was a little less than perfect. But when tragedy strikes each of them, somehow music is no longer enough. Now Logan is a guy who can't stop watching vlogs of his dead ex-boyfriend. Shay is a music blogger who's struggling to keep it together. And Autumn sends messages that she knows can never be answered.

Dara and Nick used to be inseparable, but that was before - before Dara kissed Parker, before Nick lost him as her best friend, before the accident that left Dara's beautiful face scarred. Now the two sisters, who used to be so close, aren't speaking. In an instant Nick lost everything and is determined to use the summer to get it all back.

Alex Craft knows how to kill someone. And she doesn't feel bad about it. Three years ago, when her older sister, Anna, was murdered and the killer walked free, Alex uncaged the language she knows best - the language of violence. While her own crime goes unpunished, Alex knows she can't be trusted among other people. Not with Jack, who wants to really know her but still feels guilty over the role he played the night Anna's body was discovered. And not with Peekay, the kid with a defiant streak who befriends Alex while they volunteer at an animal shelter. Not anyone.

Samantha Kingston has it all: the world's most crush-worthy boyfriend, three amazing best friends, and first pick of everything at Thomas Jefferson High—from the best table in the cafeteria to the choicest parking spot. Friday, February 12, should be just another day in her charmed life. Instead, it turns out to be her last. Then she gets a second chance. Seven chances, in fact.

Miles Halter is fascinated by famous last words - and tired of his safe life at home. He leaves for boarding school to seek what the dying poet François Rabelais called the “Great Perhaps”. Much awaits Miles at Culver Creek, including Alaska Young, who will pull Miles into her labyrinth and catapult him into the Great Perhaps.

It’s been five years since Summer Marks was murdered in the woods. Everyone thinks Mia and Brynn killed their best friend. That driven by their obsession with a novel called The Way into Lovelorn the three girls had imagined themselves into the magical world where their fantasies became twisted, even deadly. The only thing is: They didn’t do it. On the anniversary of Summer’s death, a seemingly insignificant discovery resurrects the mystery and pulls Mia and Brynn back together again, and the girls must confront what really happened in the woods all those years ago.

Tall, meaty, muscle-bound, and hairier than most throw rugs, Dylan doesn't look like your average 15-year-old, so naturally, high school has not been kind to him. To make matters worse, on the day his school bans hats (his preferred camouflage), Dylan goes up on his roof only to fall and wake up in the hospital with a broken leg - and a mandate to attend group therapy for self-harmers. Dylan vows to say nothing and zones out at therapy - until he meets Jamie. She's funny, smart, and so stunning, even his womanizing best friend, JP, would be jealous.

When Adam Blake lands the best elective ever in his senior year, serving as an aide to the school psychologist, he thinks he's got it made. Sure, it means a lot of sitting around, which isn't easy for a guy with ADHD, but he can't complain, since he gets to spend the period texting all his friends. Then the doctor asks him to track down the troubled freshman who keeps dodging her, and Adam discovers that the boy is Julian - the foster brother he hasn't seen in five years.

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 .

They say Delia burned herself to death in her stepfather's shed. They say it was suicide. But June doesn't believe it. June and Delia used to be closer than anything. Best friends in that way that comes before everyone else - before guys, before family. It was like being in love, but more. They had a billion secrets tying them together like thin silk cords. But one night a year ago, everything changed. June, Delia, and June's boyfriend, Ryan, were just having a little fun. Their good time got out of hand.

Despite my best intentions, I was beginning to understand how my dad saw the world. The shadows haunting every living thing. The secrets inside the lies wrapped in bullshit. Even Gracie’s box of pills was beginning to make sense. For the past five years, Hayley Kincain and her father, Andy, have been on the road, trying to outrun the memories that haunt them both. They moved back to Andy’s hometown to try a “normal” life, but the horrors he saw in the war threaten to destroy their lives.

Tommy and Ozzie have been best friends since the second grade, and boyfriends since eighth. They spent countless days dreaming of escaping their small town - and then Tommy vanished. More accurately, he ceased to exist, erased from the minds and memories of everyone who knew him. Everyone except Ozzie.

Lucille seems to have nothing going for her. With the bills piling in, the house falling apart around her, and her sister's growing distress, it is precisely the worst possible moment for Lucille to fall recklessly in love with her best friend's twin brother, Digby, who is practically engaged.

Henry Denton has spent years being periodically abducted by aliens. Then the aliens give him an ultimatum: The world will end in 144 days, and all Henry has to do to stop it is push a big red button. Only he isn't sure he wants to. After all, life hasn't been great for Henry. His mom is a struggling waitress held together by a thin layer of cigarette smoke. His brother is a jobless dropout who just knocked someone up. His grandmother is slowly losing herself to Alzheimer's.