When Noelle and Sam's lives collide one snowy evening, they spend eight perfect hours stuck side by side believing that they'll never see each other again. But soon their lives become entangled in ways they never expected - and it's going to change everything.

Lizzie James is happy. She has a steady office job (with a steady stream of tray bakes), has had the same best friend since secondary school, and sees her family every Thursday night for take-away and TV soaps. Granted, some members of her family she'd rather not see, and they definitely don't want to see her after what happened back then...but on the whole she's happy. Or somewhere close to it, anyway. Until a letter arrives one day from her best friend, Roman. A letter dated 12 years ago, the exact day he went missing.   

Every life is made up of thousands of moments. Moments that make us who we are. But what if those moments don't happen the way we think they should? What if you got on the wrong bus, or didn't speak to the right person at a party, or stayed in the wrong guest house on holiday? Would you miss your chance at happiness? Or would happiness find you eventually, when the moment was right? Meet Matthew and Myrtle.

Emmy Palmer is the star of Bragadon Forest, the biggest fantasy series on TV, adored by the public, living the life of glamour and luxury in London. But when scandal breaks, Emmy must escape the city and return to her seaside hometown to lie low and wait for the storm to pass. And as tragedy strikes for her family, it is good timing to go back to her roots.

As Norah battles alone, yet again, through the bustling December crowds outside Fortnum & Mason, she hears the first notes of a busker's song that transports her back to the most romantic week of her life. Laughing under an Italian sky, knowing they had to part, Andrew made her a promise: If they are both single on Christmas Eve in 10 years' time, they will meet under the clock on Grafton Street, Dublin. Norah has no idea if Andrew will remember, but she has nothing to lose.

Pippa Gallagher is rushed in to a London hospital following a traffic accident. As she lies unconscious, she is aware of fragments. The day she met Steve Gallagher, her best friend and the man who would become the love of her life. The heartbreak she felt tonight as she got into her car, her eyes blurry from tears. Meanwhile Steve sits at her bedside, his eyes fixed on her pale, still face. He has no idea where his wife was going when she crashed. No clue as to why she became distracted behind the wheel. All he knows is that she is his world. 

Quinn and Minnie are born on New Year’s Eve, in the same hospital, one minute apart. Their lives may begin together, but their worlds couldn’t be more different. Thirty years later they find themselves together again in the same place, at the same time. What if fate is trying to bring them together? Maybe it’s time to take a chance on love....

Izzy doesn’t believe in love at first sight, but when Sam walks into the café where she works one winter’s morning, she knows without a doubt that he’s the one. Too bad Sam’s getting married. Today. Nearly a year later, Izzy still can’t stop thinking about Sam, the one that got away, but she knows it’s time to move on: He’s a married man and probably wouldn’t recognize her if he passed her on the street. But Sam has never forgotten Izzy, the funny, gorgeous woman who asked him out on his wedding day.

At 15, George is the foster brother Leah never asked for. As the angry, troubled boy struggles to come to terms with his circumstances, Leah finds herself getting drawn closer to him. Theo’s wealthy family have mysteriously pulled him out of boarding school, and he’s now enrolled at the local state school with Leah and George. When their worlds collide that summer, the three teenagers form a bond they believe will be unbreakable. But life doesn’t always go to plan.

When Ros comes home after three years away, shes ready to pick up with life exactly where she left it. But her friends have moved on, her parents have rekindled their romance and her bedroom is now a garden shed. All of a sudden, she's swept up in nostalgia for the way things were. Then her phone begins to ping, with messages from her old life. Including one number she thought she'd erased for good the man who broke her heart. Is this her second chance at one big love? Sometimes we all want to see what we've been missing.

When the day finally comes for Annie to marry Alexander, the last thing she expects is to be left standing at the altar. She was so sure he was Mr Right. Now, she has no idea how she could have got it so wrong. After a chance meeting with Patrick, an old friend who reminds her of who she used to be, Annie takes a vow of her own: she’ll say yes to every opportunity that comes her way from now on. Could a spontaneous trip with Patrick be the way to mend Annie’s heart? She’s about to find out as she embarks on her honeymoon - with a man who’s not her husband.

Eve, Justin, Susie and Ed have been friends since they were 18. Now in their 30s, the four are still as close as ever, Thursday pub quiz night is still sacred and Eve is still secretly in love with Ed. Maybe Eve should have moved on by now, but she can’t stop thinking about what could have been. And she knows Ed sometimes thinks about it, too. Then one night, in an instant, all their lives change forever. And, as Eve learns she didn’t know her friends as well as she thought, she also discovers she isn’t the only person keeping secrets.

When Hannah meets Sonny, she's irresistibly drawn to him: he's sexy and confident, but only in town on holiday. That's fine with Hannah - she doesn't do long-term relationships. And luckily for her, neither does Sonny. But before they can even so much as kiss, Sonny receives some shocking news and commits to making serious life changes - ones that can't and won't include romance.

Laura has built a career out of interviewing people about their epic real life love stories. When she picks up the wrong suitcase at the airport, Laura wonders if this could be the start of something that's written in the stars. From piano sheet-music to a battered copy of her favourite book, Laura finds in the bag evidence of everything she could hope for in a partner. If Laura's job has taught her anything it's that when it comes to love, you can't let opportunity pass you by. Now Laura is determined to track down the owner of the suitcase, and her own happy ending. 

Two Lives. Two Loves. One Impossible Choice. Lydia and Freddie. Freddie and Lydia. They've been together for almost a decade, and Lydia thinks their love is indestructible. But she's wrong. Because on her 27th birthday, Freddie dies in a car accident. So now it's just Lydia, and all she wants to do is hide indoors and sob 'til her eyes fall out. But Lydia knows that Freddie would want her to live her life well.