 Europe in the Sixties was a time of great social and cultural upheaval, both exciting and turbulent. Pop music was central to this revolution. Where the government controlled a monopoly over the airwaves, young entrepreneurs and DJs took to international waters and challenged the Establishment, creating Radio Caroline, the first "pirate" radio station. Within 6 months, the pop pirates became celebrities playing music all day, every day. Radio Caroline epitomised the emergent youth culture, redefined broadcasting, and launched the careers of many of the greats of rock and roll. Max Cashman, an avid music lover, manoeuvres his way onboard Caroline and into the hearts of more than 8 million listeners. Clare, his older sister, determinedly establishes a career in politics, rising to become an aide to the Prime Minister. When the audience for pirate radios persistently out rates BBC, Clare is called upon to write legislation against the pirates and their hold over the British population. The siblings are forced against each other, learning the high price of free speech.