Ian Caldwell, born March 18, 1976, is an American novelist recognized for his intricate and suspenseful narratives, often blending historical elements with thriller and mystery genres. Caldwell’s writing is characterized by meticulous research, complex plotting, and vividly drawn characters, frequently set in historical contexts like 18th-century London. He is particularly known for his collaborative work, notably co-authoring The Rule of Four in 2004, which garnered significant attention, followed by the standalone novel The Fifth Gospel in 2015.


