You might enjoy G. K. Chesterton's 1908 novel The Man Who Was Thursday.[1] Spoiler from the Wikipedia plot synopsis: "In his efforts to thwart the council, Sy

You might enjoy G. K. Chesterton's 1908 novel The Man Who Was Thursday.[1] Spoiler from the Wikipedia plot synopsis: "In his efforts to thwart the council, Syme eventually discovers that five of the other six members are also undercover detectives; each was employed just as mysteriously and assigned to defeat the Council. They soon find out they were fighting each other and not real anarchists..." In 1977, Philip K Dick took this up a notch in A Scanner Darkly[2], in which the drug-addled protagonist is unknowingly spying and informing on himself. [1] - https://en.m.wikipedia.org/wiki/The_Man_Who_Was_Thursday https://en.m.wikipedia.org/wiki/The_Man_Who_Was_Thursday [2] - https://en.m.wikipedia.org/wiki/Scanner_darkly https://en.m.wikipedia.org/wiki/Scanner_darkly