Looking for answers to problems ignored by the political class - low-wages, un-achievable house prices, global warming, the bailout of the banks and subsequent enriching of the 1% - a new global, young and left-wing movement was born with student Occupy movements. Ten years later, Bernie Sanders was favorite to clinch the Democrat Party nomination for president, and Jeremy Corbyn and Momentum had taken over the Labour Party in Britain.

A new wave of optimistic, organised and passionate young people were building mass-participation movements outside the political bubble. 6 years after Corbyn became leader, after bitter in-fighting and allegations of incompetence, it all fell apart.

This is the inside story of how and why that happened, from the man who helped start it all - featuring unparalleled insider access and a range of interviews with key left-wing figures. Influential journalist and activist, Michael Chessum explains how this movement was built and why it failed to bring about lasting change (so far).