Police in Denmark are trying to solve the mystery of what has happened to a missing investigative journalist. Kim Wall had been with rocket engineer Peter Madsen on his submarine before she disappeared last week. James Clayton reports. Newsnight is the BBC's flagship news and current affairs TV programme - with analysis, debate, exclusives, and robust interviews. Website: www.bbc.co.uk/newsnight YouTube: https://www.youtube.com/user/BBCNewsnight Twitter: https://twitter.com/BBCNewsnight Facebook: https://www.facebook.com/bbcnewsnight Snapchat: https://www.snapchat.com/add/bbcnewsnight