Revealing the dirty secrets behind London's policing with a story of corruption that goes to the very top of the Met and leads to the formation of the first internal anti-corruption unit.

The second episode dives into the sleazy underbelly of London’s Soho in the early 1970s, where an explosion of dirty pornographic bookshops provides an open invitation for corrupt cops to be greedy.

When three armed robberies occur in the City of London, rumours spread that big money deals have been done between corrupt cops and criminals.