Rashid and his friends Gary and Chris witness a robbery at Miss Wilson's house, but the police find no evidence of a break-in. The boys' investigation leads them to the death of a Royal Air Force pilot during the Battle of Britain and an old map marking the location of a precious diamond. They also discover, however, that they are not the only ones searching for the diamond.

Throughout the story, we learn about Rashid and his family and some of the tensions Muslim families face in the modern world. We also see how Islamic values can be applied to everyday life.