In depth stories and investigations.
Ruth says she was pressured by her husband into having sex with strangers.
A devastating cyber-attack is unleashed in a British seaside town.
The incredible story of a former private spy, turned 'double agent'
Zhang Zhidong has been labelled one of the world's most significant drug traffickers
Your backstage pass when scandal collides with celebrity.
File on 4 Investigates: News-making original journalism.
