Hong Kong -- a Chinese city with British-based law, a unique place with a unique police force. In his latest book, Chris Emmett, best-selling author of "Hong Kong Policeman," puts you on the streets, alongside the Hong Kong police officers who were there during the greatest crises of the past few decades. In the 1960s, China's Cultural Revolution came to Hong Kong and in one crazy summer, ten Hong Kong police officers lost their lives, five of them to a machinegun attack at the border village of Sha Tau Kok. In the 1970s, police stood in the front line as tens of thousands of Vietnamese streamed into Hong Kong, some were fleeing oppression and some after a better life. But hiding among them were violent criminals. In 2014, the police faced a social upheaval that even today divides the city - the Umbrella Movement. Drug-runners, refugees, illegal immigrants, violent gangs, gun-wielding robbers and umbrella-wielding students - "Hong Kong Police: Inside the Lines" tells stories never before told from a unique perspective.