In the second programme in the series, Richard Bilton meets people who have made individual private lives their business, including former soldiers watching suspected thieves, corporate spies trawling company rubbish for secrets, and suppliers of tracking devices, cameras and microphones. He also explores the darker side of surveillance, delving into the criminal underworld of hackers and learning about an employee who was monitored each day and later wrongfully accused of systematically avoiding work. As surveillance technology becomes ever-more powerful, affordable and available, it has never been so easy to watch others.