A year after her adoption, Josephine's detector dog sniffs something illegal in her best friend's brother Anthony's backpack. This triggers an argument between them but Catherine ends up confessing to Josephine that her brother, the cute scientist, is being taxed at school. To avoid reprisals, he acts as a drug courier for a gang of offenders his age. The pretty blonde, worried about her brother, and JosÔephine agree to denounce Anthony and entrust the case to the adults, but events change and they soon witness the dangerous actions of the young traffickers.