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Described as 'a brilliant book' that contains a lush spy thriller passage about the meeting between Princip and Czabrinovich in the cafe, depicting Princip asking his friend to help kill the crown prince of Austria.

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Described as 'Tim Butcher's brilliant book' which advances the case that the assassination plot originated with Princip himself rather than being directed by outside forces.

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Referenced multiple times throughout the episode for historical details including Serbian armaments sourcing, identifying who suggested the assassination (Rade Malobabic as 'a super agent'), the grooming of young conspirators, and evidence that Serbian PM Pasic knew about the plot.

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Referenced for the description of the conspirators as 'useful idiots, zealous, but ignorant and so deniable' and for comparing the events to 'something from the Scarlet Pimpernel.'

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Mentioned as a book published a few years before 1914, used as a comparison to describe the spy thriller-like nature of the Black Hand conspiracy and its rituals.

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Referenced for presenting Serbian PM Pasic as 'a crafty old Serbian peasant' in his book about this period (title not specified in transcript).

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Mentioned as a comparison to the idea that the Black Hand invented elaborate rituals and spy thriller elements specifically to impress the young conspirators.