Lt. Col. John Holliday is the protagonist in a series of historical thrillers by Canadian novelist Paul Christopher (Christopher Hyde). Holliday is a former Army Ranger. The series is also known as the Templar series.

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Christopher Hyde is a Canadian author of thriller novels. He has worked for CBC as a writer and producer. His series characters include Finn Ryan and John Holliday. He commonly writes under the pen name Paul Christopher.

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