Jack Vincennes is a fictional character from the novel and film "L.A. Confidential." He is portrayed as a glamorous and ambitious detective in the Los Angeles Police Department during the 1950s. Known for his involvement in the Hollywood scene, Vincennes often uses his connections to gain fame and recognition. Vincennes is characterized by his moral complexity, as he navigates the corrupt world of law enforcement and the entertainment industry. His character serves as a critique of the blurred lines between justice and celebrity, highlighting the challenges faced by those in positions of power.