The Chinese Detective by Michael Hardwick (BBC Books 1981)

It was the main hall of one of the East End of London's Victorian-built breweries. The big ones - Charrington's, Watney's, Truman's - still prospered, almost the only remaining relics left of East End industry. This smaller one, on the corner of Milsom Street and Warner Street, would produce no more sustenance for the workers and solace for the unemployed. It was as deserted as the docks nearby, the brewing towers already partly dismantled, the rest of the building to go soon.

The young man's body was slight, but when he moved again there was a hint of great energy and purpose about him. His short hair was dark and his features boyish. An onlooker from down the length of the hall would have thought he was a local kid, looking for something to nick or smash.

They would have been only partly right. He was local. At twenty-two he was little more than a youth. A closer inspection of his good-looking features would have revealed them to be of Chinese cast. But a look at the identification card he carried would have revealed him to be Detective Sergeant John Ho, Metropolitan Police.