Minnie Cooper knows two things with certainty: that her New Year's birthday is unlucky, and that it's all because of Quinn Hamilton, a man she's never met. Their mothers gave birth to them at the same hospital just after midnight on New Year's Day, but Quinn was given the cash prize for being the first baby born in London in 1990 - and the name Minnie was meant to have, as well. With luck like that, it's no wonder each of her birthdays has been more of a disaster than the one before. 

Dannie Kohan lives her life by the numbers. She is nothing like her lifelong best friend - the wild, whimsical, believes-in-fate Bella. Her meticulous planning seems to have paid off after she nails the most important job interview of her career and accepts her boyfriend’s marriage proposal in one fell swoop, falling asleep completely content. But when she awakens, she’s suddenly in a different apartment, with a different ring on her finger, and beside a very different man. 

Every December, Josie posts a letter from her home in London to the parents she lost on Christmas night many years ago. Each year, she writes the same three words: Missing you, always. But this year, her annual trip to the postbox is knocked off course by a bicycle collision with a handsome stranger - a stranger who will change the course of Josie's life.

Laurie is sure love at first sight doesn't exist anywhere but the movies. But then, through a misted-up bus window one snowy December day, she sees a man who she knows instantly is the one. Their eyes meet, there's a moment of pure magic...and then her bus drives away. Certain they're fated to find each other again, Laurie spends a year scanning every bus stop and cafe in London for him. But she doesn't find him, not when it matters anyway. Instead they "reunite" at a Christmas party, when her best friend, Sarah, giddily introduces her new boyfriend: the man from the bus.

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. 

Eve, Justin, Susie, and Ed have been friends since they were teenagers. Now in their thirties, the four are as close as ever, Thursday night bar trivia is sacred, and Eve is still secretly in love with Ed. Maybe she should have moved on by now, but she can’t stop thinking about what could have been. And she knows Ed still thinks about it, too. But then, in an instant, their lives are changed forever.

Nell Stevens’ life is a mess. When her business goes bust and her fiancé with it, Nell’s happy ever after in California falls apart and she moves back to London to start over. But a lot has changed since she’s been gone. All her single friends are now married with children, sky-high rents force her to rent a room in a stranger’s house and in a world of perfect Instagram lives, she feels like a f--k up. 

Somewhere out beyond the edge of the universe there is a library that contains an infinite number of books, each one the story of another reality. One tells the story of your life as it is, along with another book for the other life you could have lived if you had made a different choice at any point in your life. While we all wonder how our lives might have been, what if you had the chance to go to the library and see for yourself? Would any of these other lives truly be better?

On a snowy evening in March, 30-something Noelle Butterby is on her way back from an event at her old college when disaster strikes. With a blizzard closing off roads, she finds herself stranded, alone in her car, without food, drink, or a working charger for her phone. All seems lost until Sam Attwood, a handsome American stranger also trapped in a nearby car, knocks on her window and offers assistance. What follows is eight perfect hours together, until morning arrives and the roads finally clear.

It’s the most wonderful time of the year...but not for Maelyn Jones. She’s living with her parents, hates her going-nowhere job, and has just made a romantic error of epic proportions. But perhaps worst of all, this is the last Christmas Mae will be at her favorite place in the world - the snowy Utah cabin where she and her family have spent every holiday since she was born, along with two other beloved families.

If there’s anything worse than being fired from the lousiest restaurant in town, it’s coming home early to find your boyfriend in bed with someone else. Reeling from the humiliation of a double dumping in one day, Georgina takes the next job that comes her way - bartender in a newly opened pub. There’s only one problem: It’s run by the guy she fell in love with years ago. And - make that two problems - he doesn’t remember her. At all. But she has fabulous friends and her signature hot pink fur coat...what more could a girl really need?

In her 20s Emma Blair marries her high school sweetheart, Jesse. They build a life for themselves, far away from the expectations of their parents and the people of their hometown. They travel the world together, living life to the fullest. On their first wedding anniversary, Jesse is on a helicopter over the Pacific when it goes missing. Just like that, Jesse is gone forever.

Augustus Everett is an acclaimed author of literary fiction. January Andrews writes best-selling romance. When she pens a happily ever after, he kills off his entire cast. They’re polar opposites. In fact, the only thing they have in common is that for the next three months, they're living in neighboring beach houses, broke, and bogged down with writer's block.

Tiffy and Leon share an apartment. Tiffy and Leon have never met. After a bad breakup, Tiffy Moore needs a place to live. Fast. And cheap. But the apartments in her budget have her wondering if astonishingly colored mold on the walls counts as art. Desperation makes her open minded, so she answers an ad for a flatshare. Leon, a night shift worker, will take the apartment during the day, and Tiffy can have it nights and weekends. He'll only ever be there when she's at the office. In fact, they'll never even have to meet.

Lily hasn't always had it easy, but that's never stopped her from working hard for the life she wants. She's come a long way from the small town in Maine where she grew up - she graduated from college, moved to Boston, and started her own business. So when she feels a spark with a gorgeous neurosurgeon named Ryle Kincaid, everything in Lily's life suddenly seems almost too good to be true.