John Quincannon is the protagonist in a series of historical mystery novels by American author Bill Pronzini. The series is set in San Francisco in the 19th century. John Frederick Quincannon is a former Secret Service agent who joins forces with Sabina Carpenter, one of the first female Pinkerton agents.
Bill Pronzini is an American novelist of detective fiction, western fiction, science fiction and several other genres. He is married to fellow mystery author Marcia Muller, who he often collaborates with. He is best known for his Nameless Detective novels and also writes the John Quincannon series.