The chaotic but happy equilibrium of the Nightingale family is thrown into disarray when Cecily - whose children can't remember her ever being remotely spontaneous - disappears to a Greek island with no warning or explanation. Her reasons for doing something so out of character are a total mystery to her three daughters, high-powered executive Felicity, unfulfilled GP Julia and organised mother-of-five Lily.

Penny and Victoria are about as different as two siblings can be, one with a smart London lifestyle, the other struggling to make ends meet. But they are joined by more than blood, and their shared tragic past is affecting the present more than they realise. When events begin to tug at the fabric beneath which dark secrets are hidden, the resulting chaos threatens to tear the two families apart. Could there be aspects of the past that youngest child Penny doesn't remember? Could the truth of Marge be more complex than the beloved mother the girls choose to perceive?

Alice has been lying to herself for years, holding fast to the belief that the needs of her family far outweigh her own. But her outwardly successful marriage hides dark secrets, and for much of her life the children were the only reason she stuck around. These days, though her successful banker son lives nearby, his young wife seems to do everything she can to keep Alice at bay. As for Alice's other son, he has always been something of a stranger and has been traveling for so long that Alice isn't even sure what continent he is on anymore.

Becky’s father is not just absent: he’s a total mystery, a hole in her life. He died before she was born and for her mother, Laura, the subject is strictly off-limits. When Laura books a spontaneous trip to Greece, Becky decides to join her, determined to get closer to her mother - and to the truth. But as they make their way to the island of Santorini, it becomes clear that this holiday is not as impulsive as Becky thought. Laura’s hiding something from her daughter - and she’s been hiding it for Becky’s whole life.  

Hannah is 38 and the happily married mother of 11-year-old Luke. Her marriage is reassuringly stable and after 15 years she has managed to push the wild dreams of youth from her mind and concentrate on the everyday satisfactions of here and now. The first half of her life hasn’t been as exciting as she had hoped, but then, she reckons, whose has? When she succeeds in convincing husband Cliff to rent a villa in the south of France for a summer vacation with her sister Jill and gay friend Tristan, she’s expecting little more than a pleasant few weeks with her family. 

Barbara - a child of the Blitz - has more secrets than she cares to admit. She has protected her children from the harsh realities of life and told them little of the poverty of her childhood, nor of the darker side of her marriage to one of Britain's most famous photographers. With such an incomplete picture, her youngest, Sophie, has struggled to understand who her parents really are, and in turn, Barbara sometimes worries, to build her own identity.

CC is trapped by a job she no longer loves in an unfriendly city. So when her new boyfriend decides it's time to sell up and move to the South of France, she decides in seconds to change her life. After all, who wouldn't pick an azure sea, aperitifs, and sunshine over a dreary commute and a rainy climate? She hadn't expected a tumbledown farmhouse in the middle of nowhere. Or a motley assortment of surly builders, eccentric farmers, and a resentful, terrifying neighbour - who happens to be her boyfriend's aunt.

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.

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. 

After two decades of looking after others, this is the day that Agnetha McMaster is reclaiming her life. It's her turn, her time, but will she have the courage to start again? Ten years ago, Mitchell McMaster divorced Agnetha and married her best friend, Celeste. Now he suspects his second wife is having an affair. This is the day he’ll discover if karma has come back to bite him. Thanks to a DNA test, this is the day that Hope McTeer will finally meet her biological father. But will the reunion bring Hope the answers that she’s looking for? 

When Nick’s wife Kerry falls ill and dies, he realises for the first time how fragile his happiness has always been, and how much he’s been taking his good life and wonderful family for granted. Now, he suddenly finds himself navigating parenthood alone, unsure how to deal with his own grief, let alone that of his teenage son, Olly.

Hannah has done everything to make sure her life is safe and secure. A long way from her unstable childhood growing up in foster care, she’s content with her sweet, little, messy apartment and her satisfying job as a social worker. She quietly worries that, aged 36, she might never fall in love. But otherwise her life is where she wants it to be. Until, encouraged by her best friend to join a dating app, she meets Alex. He’s irresistibly handsome. He loves the same music as her. The same food as well. 

After a health scare, 77-year-old Barbara goes to convalesce in the sleepy Somerset village of Winsleigh Green with her sister, Pauline, who is now a widow. The sisters are like chalk and cheese - Barbara, outspoken and aloof and Pauline, good natured and homely - so it’s not long before the tension starts to rise. But when Pauline accidentally knocks down a vagrant who goes by the name of Bisto Mulligan, the ladies find themselves with another houseguest.

For Emily Rossi, life may not be perfect, but it's pretty close. She has a great career, a house in the country, a solid marriage to Eric and two wonderful children - tennis superstar Daniel and quiet, sensitive Zara. But when her fourteen-year-old daughter brings home a toxic new best friend, Emily’s seemingly perfect family starts to spiral out of control.

Beth became a widow after just two years of marriage. Before her husband's death, they made the decision to freeze an embryo so that she could still have his child. But Beth has just been told that the embryo was implanted in the wrong woman seven years ago. Somewhere in the neighbourhood, her longed-for son is growing up without her. What should she do?