In 2010, Lisa Jones was on holiday in Italy with her boyfriend of six years, Mark Stone. The couple were popular environmentalists from the UK: Mark had played a key role in the 2005 anti-G8 protests in Scotland, assisted political movements in over a dozen countries, and was involved in an activist logistics company, the Activist Tat Collective. The pair had traveled together, gone to festivals together, and mourned the death of Lisa’s father together.

During that holiday, Lisa unsuspectingly pulled Mark’s passport out of the glovebox. The passport showed that Mark Stone was actually Mark Kennedy, father of two, and would help Lisa discover that Kennedy had been in the police force for two decades, deployed by the state to penetrate political threats to the status quo.

Eight years later, we know that around 150 undercover police officers infiltrated over one thousand British political groups across four decades, forming long-term relationships with women, fathering children, and engaging in some of the most radical direct action.