Justin Webb finds out what the future holds for his son, Sam, who has been diagnosed with type 1 diabetes, and the millions of other children like him.
He explores why rates of type 1 are rising in the UK, in younger children and more aggressively.
Through his own experience with Sam, he discovers the complexities involved in keeping a diabetic child healthy.
Justin talks to some of the world's leading figures working at the frontier of biomedicine who think they may have unlocked the key to curing the disease and those who are trying to find a way of preventing it.
And he finds out what uphill struggles they face when trying to beat a disease for which the causes remain unclear.
As a parent struggling to understand the impact that diabetes will have on his son's life, both immediately and in the long term, Justin explores what options are available to his child, and the thousands of children like him.