I'd recommend starting with either Pioneer Air Fighter (short, atmospheric, fairly realistic WWI stories, probably what Johns was best at) or Defies the Swastika (a swift-paced and breathless behind-the-lines WW2 action-adventure set in Norway that also features his nemesis Von Stalhein), depending on which you're in the mood for.
I don't think I'd necessarily begin with Biggles in the Orient but it's a fun and genuinely mysterious WW2-era murder mystery with - as the title suggests - some racist elements. Of the other two, Flies South is 100% 1930s pulp adventure with a not inconsiderable amount of Oh No This Is Pretty Racist, and I haven't read In the Jungle but have a bad feeling from the name.
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I'd recommend starting with either Pioneer Air Fighter (short, atmospheric, fairly realistic WWI stories, probably what Johns was best at) or Defies the Swastika (a swift-paced and breathless behind-the-lines WW2 action-adventure set in Norway that also features his nemesis Von Stalhein), depending on which you're in the mood for.
I don't think I'd necessarily begin with Biggles in the Orient but it's a fun and genuinely mysterious WW2-era murder mystery with - as the title suggests - some racist elements. Of the other two, Flies South is 100% 1930s pulp adventure with a not inconsiderable amount of Oh No This Is Pretty Racist, and I haven't read In the Jungle but have a bad feeling from the name.
I hope this helps!