Father Brown is a fictional detective created by English novelist G. K. Chesterton, who stars in 52 short stories, later compiled in five books. Chesterton based the character on Father John O'Connor (1870 - 1952), a parish priest in Bradford who was involved in Chesterton's conversion to Catholicism in 1922. The relationship was recorded by O'Connor in his 1937 book Father Brown on Chesterton.
The Innocence of Father Brown is part of the first book.