#1 New York Times–bestselling authors: Get to know the ruthless, mysterious FBI agent, "one of thrillerdom's most exciting and intriguing series leads" ( Booklist). Acclaimed as "a modern-day Sherlock Holmes" (Associated Press) with a brilliant mind, a cultured manner, and a dark edge, Special Agent Aloysius X. L. Pendergast has calmly looked evil in the face throughout the long-running series that includes such novels as The Cabinet of Curiosities—named one of NPR's 100 Best Thrillers Ever—and Crooked River. In this essay, Douglas Preston and Lincoln Child discuss how the character came to be created, his enigmatic backstory, and the history of their own wildly successful writing partnership. "The most charming, intelligent, cool, and creepy agent ever written." — Suspense Magazine "Every bit the modern equivalent of Sherlock Holmes and Hercule Poirot."― Providence Journal