It’s a miracle when Katherine’s baby boy is born healthy. But his twin sister doesn’t survive, and when Katherine is told she can’t have any more children, the loss is almost too much for her to bear. Katherine always saw herself having a big family: She remembers how the loneliness of being an only child used to overwhelm her, and she is desperate to adopt a sibling for her son. But her husband, Davis, won’t agree. He worries that Katherine will struggle when the new baby arrives.

In one split second, Aidan Whelan’s perfect world is changed forever when his wife, Rowan, and three-year-old daughter Milly are involved in tragic accident. Helena O’Herlihy and her husband, James, have been struggling in their marriage, but a knock on the door telling her that James has been involved in a car crash has Helena rushing to his side. When Aidan and Helena bump into each other at Dublin City Hospital, they soon begin to wonder if it’s more than just coincidence that brought them there.

When I found out I was pregnant, I couldn’t have been happier. Ever since my own father died, I’d felt utterly lost. But you changed everything. Finally, I had found my purpose: to be the best mother I could be. But I couldn’t–wouldn’t–tell anyone who your father was. I could never forget the look in his eyes that day. The betrayal written across his face. All the things we didn’t say and the secret that tore us apart.

All Sarah McIntyre has ever wanted was a loving, happy family. So when her husband JP announces on Christmas Day that he is leaving her and their two children, nine-year-old Harry and four-year-old Robyn, Sarah is left reeling. But things are set to get worse when Robyn is diagnosed with an aggressive brain tumour. Can JP and Sarah unite to fight their biggest battle yet? Or will they be on opposing sides once again? With the couple at loggerheads and with Robyn's condition deteriorating day-by-day, precious time is running out and JP is getting desperate....

Erika Cass has a perfect family and a perfect life. Until the evening when two detectives show up at her front door. A high school girl has vanished from Erika's quiet suburban neighborhood. The police suspect the worst - murder. And Erika's teenage son, Liam, was the last person to see the girl alive. Erika has always sensed something dark and disturbed in her seemingly perfect older child. She wants to believe he's innocent, but as the evidence mounts, she can't deny the truth - Liam may have done the unthinkable.

When Hannah met David, it was love at first sight. They were married quickly, but she knew it was the right choice. They're always laughing, the passion is unmatched, and they want the same things. Most of all, they both want a family. For David, it's doubly important. He tragically lost his first wife, Katherine, several years before. Hannah is, he says, the person who saved him from his grief. Although his friends worried he was moving on too fast, and Hannah sometimes still feels a strange jealousy towards his first wife, deep down she knows she's meant to be his happily-ever-after.

Ava’s daughter, Carly, is everything a 10-year-old should be: energetic, creative, and the light of her parent’s lives. But when she starts stumbling down stairs and walking into doors, Ava wants to rush to the doctor. Her husband, Rick, is sure she’s fretting over nothing - kids can be a little clumsy sometimes. But Ava’s instinct is telling her something is seriously wrong. Ava takes Carly to see a specialist and is given a devastating diagnosis: a rare genetic condition that will change her future forever.

I didn’t plan to fall pregnant, but when I found out, I was overjoyed. Even though I’d be going it alone, I swore I’d give my baby everything they needed. But I didn’t know who the man I met on that sweltering summer night, the father of my child, really was. I decided to keep his secret to protect the innocent…but then my beautiful baby was born with a rare illness, desperately needing a transplant.

Sisters Laura and Penny were once close, bonded together after the early death of their mother. Laura always had her younger sister’s back until one day everything changed and Penny disappeared. Twenty years later Laura finds herself alone and at a crossroad in her life; questioning her marriage and her future. Meanwhile Penny has spent her whole life running away from her problems until one day she is forced to stop and face the shocking truth. When Penny turns up on Laura’s doorstep late one stormy night, Laura is immediately suspicious of her sister’s motives.

When their last embryo is accidentally given to another woman, Quinn and James reminisce about the child they gave up 4 years prior... All Quinn has ever wanted is to be a mother. Although her husband James brings her comfort, the knowledge they have no embryos left, and that their child is out there being raised by another family, is tearing them both apart. When the clinic tells Quinn and James they have the right to spend time with little Emily, at first they hesitate. Of course, they would never want to come between Emily and her loving family.

Stella follows her handsome husband Rob to the beautifully laid-out table in the restaurant he’s chosen specially for her 40th birthday lunch. Stella knows how they must look to anyone watching. Two people very much in love, with the perfect marriage and the perfect life. But Rob is about to drop a bombshell on Stella. He wants a divorce. If she doesn’t agree to his plan - to sell the house, divide the money, and award him full custody of 14-year-old Georgie - he will tell their innocent daughter the one secret he promised to keep.

Ali turned towards the cottage, anger flooding through her. She’d believed she and Meg were friends; that they’d bonded over a vision of motherhood...a world where your baby deserved everything you could give it. She’d pulled Meg’s words - Meg’s life - around her, like a comfort blanket. But that shared vision had never existed. And Ali was alone now, with nothing to protect her.

There are two little girls in the photo. I instantly recognize myself as the small, dark-haired child in the purple dress. But who is the girl with the long, blonde hair laughing at the camera? And why is the photograph here, in a stranger’s house? When I find the tattered picture hidden away at the back of a dusty cupboard in Amy’s house, my mouth goes dry with shock. Though I haven’t known Amy for very long, I love looking after her young children, in her picture-perfect hilltop house with its sprawling wildflower garden and bright, airy kitchen.

Ruth has spent every day of the last 15 years wondering why her daughter Isobel left. Walking around the school to which she has given her life, every child she sees reminds her of her family’s bright future, which vanished in an instant. So when Ruth opens the door to find Isobel and a teenage grandson she never knew existed, she feels a rush of relief. Despite the years of hurt she never stopped loving Isobel and wants to help rebuild her life. Enrolling her grandson at the school, Ruth wants to make sure they stay for good.

When the call finally comes, my life as I know it is over—my job as a teacher, my marriage, my family are all gone. In a heartbeat, I’ve lost everything that ever mattered to me. All because of one secret and what someone thinks she saw....