It is past 10 o’clock on a cold Friday night when Rebecca and her husband Jack’s doorbell rings. Outside is a woman who introduces herself as Jack’s ex-girlfriend, Cara. And she’s holding the hand of a shivering, blue-eyed, four-year-old girl who she claims is Jack’s daughter. Rebecca is shocked to discover he has a child from his last relationship - even one he hadn’t known about. Because becoming parents isn’t part of their life plan.

When Emily’s husband dies in a terrible accident, she’s not the only wife he leaves behind. Before their whirlwind romance and Emily’s discovery she was pregnant, Pete had been married to Caroline for more than 20 years. A devastating tragedy had torn them apart. But there was a part of Pete that had never fully left his first wife and a secret that would bind them together, forever. Finding herself lonely, heartbroken, and forced to face life and motherhood alone, Emily knows she needs someone she can trust and rely on. Even if it’s the woman her husband loved before her.

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.

When Shelley first met Greg, her life had been full of possibility. A whirlwind romance, a dream wedding, moving into their first house together, thinking about starting a family.... But now, it’s 10 years since their wedding. Greg has gone. And there’s a room in the house where Shelley has shut a baby blanket away. She’s been managing to hide from her past. Until one day, everything changes. She sees the couple moving in next door, giggling as they walk up the path to their new home. The woman is pregnant. It’s like she has everything that Shelley has lost.

"I would do anything for you to get well again, baby girl." It’s a promise. Even though I know it means asking her father for help, going back there, risking everything. Whatever the cost, there’s no hesitation in my mind. Because that’s what you do when you’re a mother. You put your child’s life before your own.

In the pretty, privileged college town of Milford, New Hampshire, everyone is friendly, and everything is safe. And on this cold autumn day, as red and yellow leaves begin to fall from the trees, and everyone wraps up for the first time, it would be easy to believe nothing bad could ever happen here. Until a screech of tires is heard, a thud, a child’s scream. The crash that sees Jenna’s six-year-old daughter, Amy Rose, being hit by a car driven by 17-year-old Maddie.

Lara was seven when her birth mother died from a drug overdose. With no extended family to look after her, she was put into foster care. The care system failed Lara and now she is failing her son. Lara and her one-year-old son, Arthur, are brought to experienced foster carer, Cathy Glass, by their social worker. Lara has fled an abusive relationship and Arthur has suspected non-accidental injuries. Cathy must monitor Lara whenever she is with her son, day and night. She cannot let them out of her sight for a minute.

The doorbell rings, just days after my beloved husband’s sudden death. I don’t recognise the woman on our doorstep, with her blonde highlights, a diamond bracelet identical to my own and a bouncing baby boy in her arms. As I show her inside, I notice her eyes grow wide as she takes in our spacious hallway, and the big squashy sofas that we all used to pile on. She glances at the silver-framed family photos and my little daughter hiding behind my skirts. She looks at me, her blue eyes serious. ‘I’m sorry’ she says. ‘I am your husband’s girlfriend. And this is his son.'

Damian is just seven when he is taken in by foster carer Cathy Glass. His mother, Rachel, loves her three young children dearly, but she is vulnerable, naïve and unable to cope on her own. Cathy sets about helping Damian overcome his eating issues, with the hope that he will eventually return home. But when Rachel’s new boyfriend, Troy, arrives on the scene, Cathy becomes deeply concerned. She soon realises that Damian and his siblings are in great danger.

Jillian Kane appears to have it all - a successful career, a gorgeous home, a loving husband, and two wonderful children. The reality behind closed doors is something else entirely. For nine years, she has hid the bruises and the truth of her abusive marriage in order to protect Addie and Drew, knowing that if she left, Gordon would destroy her and destroy them. When she flees in an act of desperation, her worst nightmare is realized and she finds herself on the run with her two young children, no money, and no plan.

Angie, 6, and sister Polly, 4, are utterly distraught when they arrive to stay with foster carer Cathy Glass. Their older half-sister Ashleigh has accused their father of rape, and the two young sisters have been removed from home to keep them safe. Cathy tries to comfort the girls, but they are inconsolable. They just want their mummy and daddy, who they love dearly. The girls appear to have been well looked after, but as they settle and start to talk of life at home, it becomes clear something is badly wrong.

Elizabeth and Jackson Shore married young, raised two daughters, and weathered the storms of youth as they built a future together. But after the children leave home, they quietly drift apart. When Jack accepts a wonderful new job offer, Elizabeth puts her needs aside to follow him across the country. Until the sudden death of her father changes everything.

What was my sister doing standing over Florence’s cot in the middle of the night?I trust my sister, Carrie, with my daughter’s life. But then she’s accused of a terrible crime. Carrie lives under our roof, she pushes my daughter on the swings, she takes her out for ice cream. You might ask, why do I let her? Why would I risk my darling baby? How could I let my sister stay? Because I have a dangerous secret too. One that only Carrie knows about. And if that secret gets out, I could lose my little girl....

Named after the lager that christened her at birth, Stella's life is characterised instability and neglect. Her teenage mother abandons her in the first few weeks of her life, and left in the 'care' of her father, she ends up lying deserted in a house with no food, no water, no clothes and no warmth. She eventually lands in the care of foster carer Louise, who is determined to change her life for the better.

Little Jamey, 2½ years old, is placed with experienced foster carer, Cathy Glass, as an emergency. The police and social services have no choice but to remove two-year-old Jamey from home after his mother leaves him alone all night to go out partying. When he first arrives with foster carer Cathy Glass, he is scared, hungry and withdrawn, craving the affection he has been denied for so long. He is small for his age and unsteady on his feet–a result of being left for long periods in his cot.