Tress Walker waved her perfect husband Max off to work, with no idea that she was about to go into labour with their first child. And completely unaware that when she tried to track Max down, he wouldn’t be where he was supposed to be. At the same time, Max’s best friend Noah Clark said goodbye to his wife, Anya, blissfully oblivious that he would soon discover the woman he adored had been lying to him for years. And living alongside the two couples, their recently widowed friend, Nancy Jenkins, is getting ready to meet Eddie, her first true love at a school reunion.

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.

Sarah Morgan is a successful and powerful defense attorney in Washington D.C. At 33 years old, she is a named partner at her firm and life is going exactly how she planned. The same cannot be said for her husband, Adam. He is a struggling writer who has had little success in his career. He begins to tire of his and Sarah’s relationship as she is constantly working. Out in the secluded woods, at Adam and Sarah’s second home, Adam engages in a passionate affair with Kelly Summers. Then, one morning everything changes. Adam is arrested for Kelly’s murder.

When Charley finds herself suddenly single on Christmas Day, it feels like her world has fallen apart. Forced to move back in with her parents, she embarks on a journey of re-invention. When she meets Ed, who is on honeymoon alone after being jilted at the altar by a bride he's never met, it looks like her life may be taking a turn for the better. Fate, however, has other ideas, and she and Ed are forced apart.

Marion Miller needs a fresh start. Her childhood in Northern Ireland wasn’t easy, with a father who passed away when she was young and a mother who got lost in grief. Now grown-up and with family relations as tense as ever, Marion heads to England, to find out the truth about her father’s mysterious past – and hopefully an extended family who will love her as much as he did.