For 10 points name this author whose "Hammer of God" included his recurring detective Father Brown and who authored the novels The Napoleon of Notting Hill and The Man Who Was Thursday.
In one of his works two characters devise a secret language based on the keys of a piano to secretly communicate while meeting a mysterious man with dark glasses named Dr. Bull. In another of his works, the protagonist dines with the former president of Nicuragua and Mr. Turnbull uses his toy soldiers to help make battle plans. He wrote a short story in which the raw strength of Mad Joe is disregarded when the force of (*) gravity exerted on the title object by gravity is deemed necessary to kill the Reverend Bohun. One of his novels deals with Auberon Quinn who divides London into parts after being randomly chosen as king and in another subtitled "A Nightmare," Gabriel Syme infiltrates a group of anarchists who all turn out to be Scotland Yard agents. For 10 points name this author whose "Hammer of God" included his recurring detective Father Brown and who authored the novels The Napoleon of Notting Hill and The Man Who Was Thursday.
In one of his works two characters devise a secret language based on the keys of a piano to secretly communicate while meeting a mysterious man with dark glasses named Dr. Bull.
{Gilbert Keith Chesterton}