A glimpse into a city’s sordid decline in ‘London Falling’

In November 2019, a London teenager named Zac Brettler plunged from the fifth-floor balcony of Riverwalk, an expensive luxury apartment building along the north bank of the Thames River. After weeks of speculation and mystery surrounding his death, closed-circuit television footage from the nearby headquarters of MI6, Britain’s foreign intelligence service, would reveal that he…