Thirty-year-old Dee and her husband Luke are blissfully happy. Every day she makes her loyal parents incredibly proud. Jen has been her best friend since their days of teenage crushes, bad '90s makeup and huge hair. They are just like any other group of family and friends - living life and getting by. Until one day everything changes. Dee is gone, killed by a reckless driver, leaving the people she loved to deal with their grief in different ways. A marriage is rocked as a parent seeks justice. A husband struggles to accept the loss of his wife. 

Carly Cooper is 30, single and after coming close to saying ‘I do’ to six different men, she’s wondering if she accidentally said ‘goodbye' to Mr Right. But there is a problem. Her ex-boyfriends are scattered all over the world and Carly lives in 1999: an era before Facebook, Google, smartphones, 4G and Broadband, when it was impossible to track people down with a few clicks of a mouse. On a mission to discover if she walked away from her 'happy ever after', Carly quits her job, her flat, her whole life and sets off on a quest to track down all the men she has ever loved.

As the sun rises on a hot summer’s day, four lives are about to be changed forever.... Today, Maisie McTeer decides to track down the ex who jilted her at the altar. Today, she’ll find out that revisiting the past can also rewrite her future. After losing her husband, Harriet Bassett can no longer bear her lonely life. Today, a familiar face in a crowd will spark a quest to discover if there’s something and someone worth living for.

Laney Cochrane loves her life. With her friends Millie and Tash, she runs a proposal agency, organising the perfect setting for their clients to pop the question. Finding that forever love is something Laney knows all about. Her marriage to Cameron is blissfully content, and she has never doubted they’ll live happily ever after. Then Cara Deacon walks into their office. When Cara enlists their help to set up a romantic engagement to her boyfriend, they visualise a breathtaking scene under a moonlit Manhattan sky. 

Twenty years ago, Carly Cooper went on an epic quest to track down all the men she’d ever loved and lost in the hope that one of them was her Mr Right. Now, two decades and two teenage sons later, she thinks she might have got it all wrong. As the years have passed, lots of things have changed, leaving Carly asking, ‘What now?’ With a divorce and an empty nest on the horizon, Carly sets off once more to Los Angeles with her band of trusty girlfriends, to find the carefree, wild and adventurous Carly Cooper that she used to be.

Lou Cairney's life has never been dull. But through twenty years of ups, downs and really bad hairstyles, Lou has had the best friends a woman could hope for in Lizzy and Ginger. Growing up together, they shared their dreams and their disasters, broken hearts and career crashes and they survived it all thanks to love, hope, a large dollop of humour and cocktails. Until now; Lou needs her friends more than ever. Her past has just caught up with her in a shocking way. 

When Tess married Drew Gold, she knew his two ex-wives were still in his life. Now Drew has planned a luxury cruise to celebrate his birthday, and all the former Mrs. Golds are coming too...Drew’s second wife, fashion editor Mona, never puts a Louboutin wrong when it comes to style. Now it's time to reclaim the only man she ever really loved...if she can tempt Drew away from Sarah Gold, his new wife for a second time. When Drew left his first wife, Sarah, for the glamorous Mona, Sarah's emotions went into hibernation. Now she's decided to shave those legs and start living again.... 

Colm O’Flynn was loved by his close circle of family and friends, however his death came too soon for everyone to make peace with their past. Shauna, his second wife, adored him. But one night she broke their marriage vows and didn’t get time to ask Colm’s forgiveness. Jess was the first Mrs O’Flynn. Her heart is set on someone new, but will the last one-night stand she shared with Colm come back to haunt her? Colm’s best friend, Dan, is recently divorced. Can he take a second shot at happiness if it means betraying the one person who always had his back?

Colm strolled into my life 15 years ago. If there's ever such a thing as love at first sight, that was it for us both. A few weeks later we married, celebrating with those who cared. This was going to be forever, the happy ever after...until it wasn't. We discovered a devastating truth, one that blew away our future. What would you do if your husband slept with another woman?

You know that ‘till death do us part’ bit in the wedding vows? Well Zoe Dalton believed it. She walked up the aisle thinking that she was strolling to her happy ever after. One month later, her heart is in pieces, she’s returning the wedding gifts and there’s a husband-shaped space next to her in bed. He’s gone, after Zoe discovered a devastating secret. But Zoe has lost so much more than her marriage. Her three sisters are not only her siblings, they’re her best friends, too. Now she’s discovered that one of them may have been the reason her husband betrayed her. 

The Chamberlain family - Charlie and Daphne and their children Laura, Scott and Nick - had fantastic summer holidays when they were young. But then, inevitably, the children grew up, and their own messy lives got in the way. Since their mum died, it feels to them all as if their family just isn't that close any more. And Charlie fears his kids have all lost their direction. For his 80th birthday, all Charlie wants is to bring his family together again - and by some miracle, they've all said yes. It's only 10 days...how hard can it be?

Cara has officially run out of men. Her most recent dates have gone from bad to worse, and when her dating app informs her there is no one left in her area to choose from, she is at a dead end. But with a summer of events ahead of her, she needs to find a solution, fast; someone to keep her company at the never-ending weddings, family gatherings and gender-reveal parties that she can’t face going to alone. So when she meets handsome, confident, Millsy on a night out, she may be in luck. They could not be more different in personality, but he, too, has a summer of events ahead.

Peach is excited to hear that her sister, Di, is getting married. Of course, she would have preferred her little sister to be engaged to someone she's known longer than a week - and the fact that his name is Charles doesn't bode well - but who is she to judge? After all, her own love life is non-existent, and who doesn't love a destination wedding? 

When her loving, free-spirited grandmother Primrose passes away, Victoria is bereft, yet resilient - she has survived tragedy before. But even her strength is tested when a mysterious woman attends Prim's funeral and claims to be the mother Victoria thought was dead. As the two women get to know each other and Victoria begins to learn more about her past, it becomes clear that her beloved grandmother had been keeping life-changing secrets from her. Desperate for answers, she still struggles to trust anyone to tell her the truth.

When recently engaged Nat flips through a bridal magazine, she spots a quiz on page 111 about being ready for marriage. After failing it, she’s determined to prove it wrong. If only it was that easy. Getting married to Archie, whose smile makes her insides go funny, should be a dream come true. So why is it a total nightmare?