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It's an extraordinary story: spyware that spread through as little as a missed WhatsApp call and was used to keep tabs on high-profile targets - from Princesses to Presidents.
The Pegasus cybersurveillance tool was created by Israeli company NSO Group and - once on a phone - could read text messages, collect passwords, record calls and turn on your camera.
But perhaps even more extraordinary is how its use was exposed by an international consortium of journalists who worked in secret for months on the story.
It began with the leak of 50,000 cellphone numbers to French non-profit group Forbidden Stories, who drew in 17 media organisations to help work on the investigation which came to be known as 'The Pegasus Project.'
Susie speaks with Sandrine Rigaud, editor-in-chief of Forbidden Stories and co-author of a book called 'Pegasus: The Story of the World's Most Dangerous Spyware'. She details the methodical search for infected phones and who they belonged to and the paranoia that stemmed from trying not to be caught.
