Leonard Pine is a fictional character from the Harry Bosch series of novels written by Michael Connelly. He is a private investigator and a close friend of the main character, Harry Bosch. Leonard is known for his sharp intellect and resourceful nature, often assisting Bosch in solving complex cases. In addition to his investigative skills, Leonard Pine is characterized by his tough demeanor and a strong sense of justice. He often navigates the challenges of the criminal underworld, showcasing his loyalty and dedication to uncovering the truth, making him a vital ally in Bosch's endeavors.