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.  

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.

As single mother Leah struggles to get her children ready one morning, the doorbell rings. Standing on the doorstep of their terraced house in Whitley Bay is a well-dressed stranger, Clio, who feels an emotional tie to the house that she can’t explain.

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.

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.

Seven years after his sister vanished without a trace, Jude is on the road, determined not to return home until he has found her. He wants to reunite his broken family, but more than this he wants to know why Zoe left. They’d been enjoying the funfair - grasping a rare moment of happiness following their parents’ divorce - when after a ride together, Zoe had stopped speaking to her mother’s new partner. Though Mandy believed he was the man she’d waited all her life for, her love for her daughter trumped even that.

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. 

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.

Thomasina "Hitch" Waycott loves living and working on the remote family farm and B&B. But she also wants more. To see the world. To own her own home. To fall madly in love. But those are fairy tales, and if her life is a fairy tale, then she’s the ugly duckling. Her deformed lip, her crooked limbs and her weak heart have kept her from taking chances. But that’s about to change. When Grayson Potts comes to stay, he’s unlike anyone Thomasina has ever met.

Berlin, 1989. Siblings Rune and Lotte are shaken awake by Mama and told to follow her quietly into the night. Last time they snuck away from Papa, with Mama bruised and broken, they were back within a week. But this time they are starting a new life, Mama says - where nobody can ever hurt them again. Ten years later, the memories of their escape are blurry; Mama is long gone, and the siblings are back at Papa’s house.

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.

Nina McCarrick has it all: a loving husband, two beautiful boys, a well-appointed home and more time than she knows what to do with. Life is perfect. Until her husband, Finn, is killed in a car accident and everything Nina thought she could rely on unravels.

Josie Bianci was killed years ago on a train during a terrorist attack. Gone forever. It’s what her sister, Kit, an ER doctor in Santa Cruz, has always believed. Yet all it takes is a few heart-wrenching seconds to upend Kit’s world. Live coverage of a club fire in Auckland has captured the image of a woman stumbling through the smoke and debris. Her resemblance to Josie is unbelievable. And unmistakable. With it comes a flood of emotions - grief, loss, and anger - that Kit finally has a chance to put to rest: by finding the sister who’s been living a lie.

Dear Lily, It’s me, Joy, your older sister. I thought I’d start a new tradition of letter writing - now that we’re long distance. On the plane over here, I began to cry. I think the magnitude of it finally hit me, after everything that happened. I’m sorry for abandoning you - I’ve always been a buffer in your shouting matches with Mum. But I had to leave, Lily, I had to. Anyway, I’m here now. I want to learn to laugh again and to find someone to love who will love me back. Wish me luck, little sister. Love, Joy x

When Catherine learns that she is dying, she remembers the words her husband once jokingly uttered and decides to leave him the ultimate posthumous gift: a time capsule containing photographs of their life together along with tape recordings in which she recounts every secret she ever kept, every unspoken thought whether loving or treacherous - the things they never said.