When Sunil develops diabetes, his best friend Ahmed learns about it and does his best to provide support. After a clear explanation, with diagrams, of how diabetes develops, Ahmed explains about how Sunil injects himself, how his mum ensures that Sunil gets enough glucose, something about healthy diets, what happens when Sunil has a 'hypo' and how it can be prevented or stopped, how Sunil's diabetes affects him at school and during sports, and a detailed look at testing blood and the equipment needed. We see Sunil at his diabetes clinic with the team who look after him, and Ahmed cheering him up when he's feeling low. The book ends with a good explanation of what to do in an emergency when someone passes out from a serious hypo, and two pages of 'Questions People Ask'. Fact boxes throughout add much to the information, and a glossary, an index, and a list of useful organisations (including websites aimed at children and young people) complete a useful and accessible production.