This is a story of cooperation and courage in which Sam and her brother Will take on the school bully. For four months, Will and eight other boys have been regularly beaten and robbed by 'a punching, kicking, Year 9 brute of a boy', Billy Jones. Will has spoken to no one about his predicament but now he is starting to behave strangely at home. Out of the blue, the family is joined by two unexpected visitors - Dermot and Erika Knight. This 'dynamic duo', as Will calls them, turn out to be private detectives. With their help, the siblings acquire the expertise and the technology to bring Billy to justice.