In September 2012, passers-by ran across a badly mangled body of a man on the streets of London. There were no identity papers on him and no one reported him missing. But that's not the only mysterious thing about him: the dead man's fatal injuries couldn't have been caused by a traffic accident, so the only logical explanation was that he fell to his death. But from where and how?
The solution to this mystery spanned two continents and eight countries, as Andy Brownstone of the BBC explains: Link [self-starting video]