Detective John Corey is a fictional character created by author Nelson DeMille. He is known for his sharp wit and unconventional methods in solving crimes. Corey often finds himself in complex situations, using his keen observational skills and experience to unravel mysteries. Corey first appears in the novel Plum Island, where he investigates a murder linked to a secretive government research facility. Throughout the series, he faces various challenges, including personal struggles and dangerous adversaries, making him a compelling and relatable character in the detective genre.