J.S. Puller is a fictional character created by author David Baldacci. He is a military investigator known for his sharp intellect and strong sense of justice. Puller often finds himself solving complex cases that involve crime and corruption, showcasing his skills in both investigation and combat. The character appears in a series of novels, starting with Zero Day. Puller's background as a military police officer adds depth to his character, as he navigates personal challenges while pursuing the truth. His stories often blend action, suspense, and intricate plots, making him a popular figure in contemporary thriller literature.