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.

Ryan and Phil had always been inseparable. Twins born 35 minutes apart, Ryan was the protective one, constantly looking out for his younger brother. They can't remember how old they were when the abuse started, but they can remember their uncle very clearly. A frequent visitor to their home in Lincoln, he lavished their family with expensive treats. School holidays and weekends were spent visiting him, when he would often take the two little boys aside to play the games he liked. Trapped with him, day after day, year after year, the abuse continued until Ryan and Phil turned 16.

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.

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.

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.

When Stevie’s social worker tells Cathy, an experienced foster carer, that Stevie, 14, is gender fluid she isn’t sure what that term means and looks it up. Stevie, together with his younger brother and sister, have been brought up by their grandparents, as their mother is in prison. But the grandparents can no longer cope with Stevie’s behaviour, so they place him in care. Stevie is exploring his gender identity, and like many young people he spends time online. Cathy warns him about the dangers of talking to strangers online and advises him how to stay safe. 

Daisy-May Jones was four years old when she was told by her parents the family was moving halfway across the world to Australia for a better life. Leaving everything behind, including her beloved grandparents, Daisy-May spent a happy and secure few years adapting to a new life. But after the breakdown of her parent's marriage, she stepped into a nightmare as her mother introduced a new step-father to her and her disabled brother. 

Foster carer Maggie Hartley is finally enjoying a well-earned holiday from fostering, savouring time with her brand-new baby granddaughter. One night, though, the peace and quiet is interrupted by an urgent call from Social Services. A man has been stabbed, and Social Services need to find an emergency placement for his little girl. Maggie is used to children arriving on her doorstep at all times of the day and night, but nothing can prepare her for the sight of 11-year-old Nancy. 

After years of suffering multiple forms of abuse, a vulnerable young girl flees her home only to land straight into the arms of her biological father - a sexual predator. My Daddy the Pedophile tells the harrowing true story of a teenage girl’s affair with her manipulative sociopathic father. After a terrible dark secret comes to light, the real story unfolds and her courageous journey of healing begins.

Little Jamey, two and a half years old, is placed with experienced foster carer, Cathy Glass, as an emergency. The police and social services had no choice after a neighbour reported Jamey had been left alone all night while his mother went out partying. Scared, hungry and withdrawn, Jamey has spent so much time in his cot that his leg muscles haven’t developed, and he can barely walk. He is craving affection, and Cathy and her family find him very easy to love. However, as Jamey begins to settle in and make progress a new threat emerges. Coronavirus and lockdown change everything.

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. 

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. 

Harley, 13, has been sectioned under the mental health act after attempting suicide. She was spotted climbing the railings on a footbridge that crossed a busy motorway and pulled to safety by a member of the public. After six weeks in hospital, social services are looking for a short-term placement so she can be kept safe while family therapy takes place. Harley has a family - a widowed mother and an older sister, Milly, who left home with her long-term boyfriend just over a year ago. 

Casey's Unit is, as ever, full of troubled, disaffected pupils, and new arrival Leo is something of a conundrum. Thirteen-year-old Leo isn't a bad lad - in fact he's generally polite and helpful, but he's in danger of permanent exclusion for repeatedly absconding and unauthorised absences. Despite letters being sent home regularly, his mother never turns up for any appointments, and when the school calls home she always seems to have an excuse.

At just 10 years old, Kirsty has suffered a lifetime of heartache. Neglected by her teenage mother and taken into care, Kirsty thought she had found her forever family when she was fostered by Pat and Mike. But when Pat has a heart attack and collapses in front of her, Kirsty's foster family say it's her fault. Kirsty is still reeling from this rejection when she comes to live with foster carer Maggie Hartley. She acts out, smashing up Maggie's home, and even threatens to hurt the baby boy Maggie has fostered since birth.