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After reading 1417 websites, we found 2 different results for "Who wrote Liar Spy"

Brothers Harry and Jack Williams

Brothers Harry and Jack Williams created Liar after previously pairing up on BBC

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Oswego

Toward the end of the next year, 1821, Oswego published the Spy, followed swiftly by the Pioneers, and by the Pilot; and by these three books Oswego's fame was firmly established, in Oswego's own country, in Great Britain, and all over Europe, where Oswego was hailed as a worthy rival of Scott.

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