The trail opens on Pottinger Street in Central, Hong Kong, with a buried keystone in view: a letter Lin Zexu addressed to Britain’s queen, a prelude to events that would shape the city’s fate. The host walks the sites of the first clashes with Britain and recalls Lin’s resolve to fortify the coast with shore batteries to defend the island.

With historians’ close analysis, the episode reconstitutes the tempests off Humen and weighs the contest between China and Britain in its time. The camera glides between Hong Kong’s contemporary cityscape and its quieter historical marks, tracing Lin’s steady concern for this coast and uncovering the imprints history has left on the city.