But it is also the story of her family, who have always supported her - her mum, who battled with feelings of guilt over Kirsteen's condition, her dad, who sacrificed career advancement and earning capacity to look after his family, and her brothers, who have watched as their parents struggled to support their sister. Kirsteen Lupton seems like any other teenage girl; she goes to school, adores music and argues with her parents about staying out late.

But Kirsteen was born with a rare medical condition: her bladder was on the outside of her body. By the age of seven she had endured numerous agonising, failed operations. Medical complications left her weighing just 1½ stone and battling for her life. Finally, surgery by the team at Great Ormond Street Hospital gave her a chance at a normal life.

What makes Kirsteen so exceptional is that she has since raised over £750,000 for the hospital. She has comforted worried parents as their children prepare for surgery. She has given speeches to politicians and celebrities around the country. In 2006, she was named 'Fundraiser of the Year' at the Pride of Britain awards.

This is the story of Kirsteen's extraordinary life and her determined work to raise funds for the hospital that helped her so much. It is also the story of her family, who have always supported her - her mum, who struggled with feelings of guilt over Kirsteen's condition, her dad, who sacrificed career advancement and earning capacity to look after his family, and her brothers, who have seen at first hand Kirsteen's suffering and their parents' desperate struggle to help her.

It is an inspiring account of a family's unity and strength, and a little girl's determination to give something back.