Lisa Jones was an environmental and social justice activist. In 2010 she discovered that her partner of six years, Mark Stone, was actually undercover police officer Mark Kennedy.
She gathered evidence, confronted and exposed him. This began a slew of revelations that dragged the murky world of the political secret police into the light.
Eschewing media exposure, Jones was one of eight women who took legal action against the police and, after a gruelling four years in the courts, received an unprecedented apology late last year. Now she is coming forward to tell the story for herself.