A undated photo of Kay Mah (left) provided by her grandson Albert Mah. Photo: SMP Pictures

Codename Castra: the Post reporter-spy who defied the Japanese during the second world war

Archives have revealed the secret workings of a former Post reporter who became an undercover agent in the wartime fight against the invaders

Topic |   Hong Kong's second world war history

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A undated photo of Kay Mah (left) provided by her grandson Albert Mah. Photo: SMP Pictures
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