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.

A 5-year-old boy, Ethan, is brought to Casey in the middle of the night after the sudden death of his young mother after a drug overdose. Estranged from her parents, Ethan’s mum had been abused by her ex-partner, and began taking drugs to cope. Ethan is obviously lost and bewildered, and regularly wakes up screaming for his mum in the night. He begins to lash out at other kids at school and his behaviour becomes more volatile. 

Brought to Casey as a short-term emergency placement, 14-year-old Adrianna arrives with nothing but her gratitude. Having turned herself in to a social services office some 100 miles away, she has no possessions, no English and, apparently, no history - not that she's willing to share, anyway. She is a beautiful young Polish girl, with the bearing of a ballerina, but is terrified, malnourished and unwell.

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.

Foster carer Maggie Hartley is used to all manner of children arriving on her doorstep, but nothing can prepare her for sisters Billy and Bo when they arrive at her home. It is clear from the moment she sets eyes on them that four-year-old Bo and seven-year-old Billy have clearly been subjected to unimaginable neglect, and it takes all of Maggie's skills as a foster carer to try to connect with the volatile little girls, who seem far younger than their years. 

It's late on Friday night when Casey's mobile starts to ring. She is expecting it to be her daughter, Riley. But it isn't Riley. It's a woman from the Emergency Duty Team. So begins Casey and Mike's latest fostering challenge - a 15-year-old girl called Keeley who's run away from her long-term foster home 25 miles away.

After taking a few weeks off work, Casey is presented with a new foster child: 14-year-old Elise, whose Mum left her at just five years old. At first, she’s no trouble at all, that is until she falsely accuses another carer, Jan, of acting inappropriately towards her. It turns out this isn’t the first lie Elise has told—her previous carer was constantly following up allegations Elise had made of people bullying her, trying to have sex with her or hurting her physically. 

Just when Casey thinks her foster care duties are done, she’s asked to look after Sam, a troubled nine-year-old with a violent streak who drove his previous guardians to release him of their care. It soon unfolds, however, that this is no simple case. Determined to get to the root of Sam’s behaviour, Casey is committed to uncover his mysterious past only to find out something far darker than she ever imagined.

Casey Watson is back, doing the job she does best - rolling up her sleeves and fostering the children who, on first meeting, seem like hopeless cases. But when she meets Miller and discovers the truth about his disturbing childhood, even Casey begins to doubt if this child will ever be able to accept love. Found naked and alone on a railway track, Miller was just five when he was first admitted into the care system. 

Six-year-old Amelie lives with her mother, Kelly, who suffers from bipolar disorder. After Kelly attempts to burn down their family house, it becomes clear that her daughter is in grave danger. Amelie is quickly taken into care. When she arrives with foster carer Casey Watson, Amelie acts much younger than her age. Casey must get to the root of Amelie’s behaviour, while doing what she can to keep the family together. Will Amelie ever find the safety of home?

The Watsons are no strangers to sibling placements, but when Casey takes the call from her supervising social worker one frosty January morning, she can instantly tell from the tone of her colleague’s voice that there’s a complicated case ahead. And she’s right. A four-day-old baby boy called Tommy - born in prison - plus his four-year-old half-brother, the lively Seth. A month later, the very moment she gets out of prison, the boys’ mother - a 19-year-old called Jenna - also follows.

It’s February 2019, and experienced foster carer Rosie Lewis has joined Mockingbird, a new fostering scheme designed to help families stay together. After her first week in post, the foster carer takes a call from a social worker in the Child Protection Team—Bonnie, mother of four children, has been sectioned under the Mental Health Act. Her mother, Julie, volunteers to care for her grandchildren, but social workers insist on providing outside support.

For the first few years of her life, Sarah Harris was a normal, happy, popular little girl. But from the age of six she was targeted by a vicious, manipulative but invisible enemy - and her life became a living hell. Before long she was suspended from school, alienated from her friends, completely bewildered and utterly terrified. Her happy childhood had been destroyed forever.

Three siblings arrive at Maggie's door after being taken into care. Teachers of eight-year-old Bobby spotted bruises while he was getting changed for PE and his dad, Lee, and stepmother, Brianna, have been uncooperative and hostile to Social Services. While they investigate, Bobby, as well as Brianna's daughters, Melodie and Poppy, are all placed in Maggie's care. But as the children settle in, a thought won't let Maggie go. While Melodie and Poppy are clean, well-fed and immaculately dressed, Bobby is pale, severely underweight and crawling with lice.

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.