In our lives we'll meet something like 80,000 people. Most of them just in passing, sitting beside them on a bus, buying a latte from them, overtaking them too fast on the motorway. Others will become friends, lovers, family. Some will stay in our lives forever, and some will be swept away by the flow of life. But we touch all of these people in some way, tiny or huge, making more of a difference that any of us can imagine. Rosie is in a coma, unable to reach out to the world or communicate. 

The first rule of heartbreak club is - get your heart broken. That's all really. Caroline's heart broke when her husband took his own life. Josh's heart broke when his wife was killed in an accident. And somehow, talking to a group of strangers once a week doesn't seem to be helping either of them. Until Sylvia arrives. When she lost her own partner two years ago, she fell apart and had to put herself back together. Most of all she wished for the help of someone who'd been through it already. And now she's here to pass her handbook on to those who need it most. 

Annie has been sad for so long that she's forgotten how to be any other way. She's trudging miserably through every day, sheer determination keeping her going. Until she meets Polly. Polly is everything that Annie is not. She's colourful, joyful, happy. Because if recent events have taught Polly anything, it's that your time is too short to waste a single day. 

Since she inherited the Starfish Café, Hollie has poured her heart into the business, striving to keep her mother's traditions and warm-hearted spirit alive. But behind closed doors, Hollie is searching for true happiness, as she grieves the tragic loss of her family who were once the beating heart of the café. Jake lives by two rules: don’t let anyone get close, and don’t talk about what happened. Can Hollie and Jake break down the barriers that have been holding them back from finding love and happiness before Christmas comes around? With courage, nothing is impossible.

Married to her childhood sweetheart for over 12 years, Elise feels like starting a family is the next natural step. However her husband, Gary, has other ideas. Suddenly single, Elise is completely heartbroken and struggling to start over on her own. But when she's enlisted to be bridesmaid to her best friend, Sarah, she has to put on a brave face, put her own feelings aside and find a way to get over Gary. Fast. So when she meets handsome, recently divorced Daniel, she thinks he could be just what she needs. But why can’t she shake the feeling that he must be too good to be true?

Nell and Charlie feel a spark when they meet by chance in a café. But they don’t trade numbers, or surnames, so there’s no way they’ll meet again. But the next day, Nell’s phone rings at work. Somehow, impossibly, Charlie is on the other end. And he needs her help. Nell is about to save a life, fall in love...and risk everything for a perfect stranger.

Life in Dublin hasn't worked out quite as planned for friends Melissa, Steph and Eilis. Melissa has a successful career, but she's a mess of insecurities. Steph is lonely, walking on eggshells around her philandering husband and angry teenage daughter. And Eilis, an A&E doctor, is just going through the motions with her long-term partner, Rob. Is it ever too late to take charge and live your life on your terms?

Kate Owen is a woman fleeing from the past. Leaving a rewarding job in London, she’s uprooted her life and given away her daughter to keep them both safe. Damaged from a traumatic event that broke her family apart, she attempts to find peace in Liverpool. There she meets the seemingly eligible Alex Price, who offers her a glimpse of a happy future. But there are those in London who can never forget what she did and believe she holds the key to the unfinished business she left behind in the capital.

On her 47th birthday, Sydney Smith stands on a rooftop and prepares to jump.... Sydney is a cartoonist and freerunner. Feet constantly twitching, always teetering on the edge of life, she's never come to terms with the event that ripped her family apart when she was 10 years old. And so, on a birthday that she doesn't want to celebrate, she returns alone to St Ives to face up to her guilt and grief. It's a trip that turns out to be life-changing - and not only for herself.

You never forget the one that got away, do you? Nell Mason is extremely happy with her life–or at least that’s what she tells herself. She’s lucky to have a high-powered job as a lawyer, even if it does come with an eccentric set of billionaire divorce clients. And she’s absolutely fine living with her sweet, if slightly dull, boyfriend Gus in their London flat, where they have very sensible sex once (okay, sometimes twice) a week. She’s definitely not stuck in a rut.

Every December, Josie posts a letter to the parents she lost one Christmas night, many years ago. She always writes the same three words: Missing you, always. When Josie accidentally collides with a stranger at the postbox, she is unaware that Max has his own reasons for trying to avoid the season...or that their chance encounter is set to alter both their lives - and their hearts - in the most unexpected and beautiful of ways....

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.

I’m Lucy. Out-of-work actress, part-time princess impersonator, Dorito enthusiast. Oh, and I’ve lost my memory. I got knocked off a bicycle on my way to a children’s party, dressed as Elsa, and accidentally flashed my thong. Now, in my head, it’s 2009 and I’m 17 years old. Not nearly 30 and starting to wrinkle. By this stage of my life, I thought I’d be married, with kids and a mortgage. Instead, I’ve got a phone full of dick pics. As I make my way through my contacts list - and try to jog my memory - I can’t help asking: Am I allergic to love? Commitment? Men?

When seven-year-old Fran first met Will they knew instantly that they were made for each other. For 11 years they were inseparable, but then, at the age of 18, Will just upped and disappeared. Twenty-five years later Will is back. Is fate trying to give them a second chance? Still nursing the heartbreak from all those years ago, Fran is reluctant to give Will the time of day. The price Will must pay is to tell the truth - the truth about why he left, the truth about why he’s back.

When I got pregnant, Will and I didn’t have a clue what we were signing up for. It turns out that there’s loads we weren’t warned about. But even if I feel like I’m waiting for my motherhood powers to come in the post, at least I’ve got Will. Our old life - festivals, sambuca shots, an actual sex life - might be a distant memory, but we can get through anything together, can’t we? At least that’s what I thought until, one day, Will walked out on us.... If I’m on my own (apart from Siri, obviously) can I do this whole parenting thing?