The Black Swan
9pm, BBC Four
Denmark has been named the least corrupt country in the world for the past six years, but this astonishing documentary series by film-maker Mads Brügger shows a darker side to the nation. Secret cameras film the lawyer Amira Smajic, a once trusted adviser to notorious gangs, and her undercover meetings with criminal clients – starting with a double bill that follows cases including dumping illegal toxic waste and managing bankruptcy without scrutiny. Hollie Richardson
