Lieutenant D'Agosta is a fictional character from the Pendergast series of novels written by Douglas Preston and Lincoln Child. He serves as a police officer in the New York City Police Department and often collaborates with the eccentric FBI agent Aloysius Pendergast to solve complex cases. D'Agosta is characterized by his dedication to law enforcement and his pragmatic approach to investigations. Throughout the series, D'Agosta faces various challenges, including dealing with unusual and often dangerous situations. His relationship with Pendergast is central to many plots, showcasing a blend of contrasting personalities—D'Agosta's grounded nature complements Pendergast's unconventional methods.