Fourteen-year-old Hannah comes to live with foster carer Maggie Hartley after her mum pleads with Social Services to take her into care, unable to cope with her daughter anymore. Previously a good student, a loving daughter and sister, Hannah is now playing truant, drinking and taking drugs. Angry and mistrustful, it seems that nobody can reach this troubled teenager. 

Three-year-old Lexie, five-year-old Amelie and thirteen-year-old Leo come to Maggie after Leo confesses to a teacher that his mother's addiction problems and her latest violent relationship has left him as the sole carer to his younger sisters. Maggie welcomes the three children into her home and is touched by the gentle care Leo shows to the two little girls. It is clear that Lexie and Amelie adore their big brother and rely on him for comfort and reassurance.

The heartbreaking story of three little children searching for someone to love them. Maggie Hartley faces one of the toughest challenges of her career when three abused and neglected siblings she’s been caring for are placed for adoption with a family she believes are unsuitable. The couple are looking for a perfect ready-made family, and Maggie knows that they’re not going to find it with these traumatised children. And when her worst fears come true, Maggie must fight against the very system she’s part of to have the siblings returned to her so that she can start to undo some of the damage that has been done.

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.

Ruth was a ghost of a girl when she arrived into foster mother Maggie Hartley's care. Pale, frail and withdrawn, it was clear to Maggie that Ruth had seen and experienced things that no 11-year-old should have to, that she had been conditioned to 'see no evil, speak no evil'. Ruth is in desperate need of help, but can Maggie get through to her and unlock the harrowing secret she carries? Through love, reassurance and patience, Maggie starts to unravel Ruth's painful past.

When 16-year-old Jess arrives on foster carer Maggie Hartley's doorstep with her newborn son, Jimmy, she has nowhere else to go. Arriving straight from the hospital, having just given birth, Jess is like a rabbit caught in the headlights. Scared, alone, and practically a child herself, she is overwhelmed with the responsibility of caring for a newborn without the support of a loving family or her beloved boyfriend. With social services threatening to take baby Jimmy into care, Jess knows that Maggie is her only chance.

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.

Oskar's school teacher raises the alarm. Oskar's mother is abroad, and he has been left in the care of friends, but has been arriving in school hungry, unkempt and with bruises on his arms, legs and body. Experienced foster carer Cathy Glass is asked to look after him, but as the weeks pass, her concerns deepen. Oskar is far too quiet for a child of six and is clearly scared of something or someone.

Evie and Elliot are scrawny, filthy and scared when they turn up on foster carer Maggie Hartley's doorstep. Aged just two and three years old, this brother and sister have hardly set foot outside their own home. They have been prisoners, locked in a world of abuse, violence and neglect. Maggie soon realises that Evie and Elliot are lacking the basic life skills we all take for granted, and the outside world terrifies them. Gradually unlocking the truth of their heartbreaking upbringing, Maggie tells their shocking true story.

Fourteen-year-old Shazia has been taken into care after a conversation at school leads her teacher to suspect that the teenager's family are planning to send her to Pakistan for an arranged marriage. To her family's fury, Shazia is sent to live with foster carer Maggie Hartley whilst social services investigate. But with Shazia denying everything and social services unable to find any evidence to support the teacher's fears, Shazia is allowed to return home. But a few weeks later, Maggie is woken up in the middle of the night by a phone call from a terrified Shazia, who has managed to escape the family home through a window. 

Experienced foster carer Rosie Lewis is used to looking after children from difficult home situations, but she finds herself struggling when she agrees to take in Taylor and her younger brother, Reece, for a short while. Taylor tries desperately not to fit in, to be the tough young teen that she has had to become, making it clear that she cares about nothing and no one, while Reece is just desperate for someone to love him.

Experienced foster carer Rosie Lewis takes on the heart-breaking case of Megan, a baby born with neo-natal abstinence syndrome and a cleft palate. Addicted to drugs from birth because of her mother's substance abuse during pregnancy, new-born Megan is taken into Rosie's loving care. Rosie is supposed to help Megan find her new permanent home, but it turns out that Megan has already found her 'forever mummy' in Rosie.

Nine-year-old Archie and his five-year-old sister, Bobbi, are taken into emergency police protective custody after an incident of domestic violence at their family home. Rosie collects the children from their out-of-hours foster carer on New Year's Day and instantly recognises Archie from a domestic violence workshop she helped with. Rosie remembers that when asked what he enjoyed most about the course, Archie said, 'The biscuits'. Social workers are concerned that Archie and Bobbi have been neglected.

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. 

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.