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The Case of the Baker Street Irregulars
https://en.wikipedia.org/wiki/Mary_Roberts_Rinehart
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The Development of Spy Novels
The themes of the spy novel are similar to the adventure novels, thrillers, and politico-military thrillers.
https://en.wikipedia.org/wiki/Mary_Roberts_Rinehart
The themes of the spy novel are similar to the adventure novels, thrillers, and politico-military thrillers.