Jim Orrington, news reporter, is at the office when the Secretary of War brings in a letter--mostly likely a prank--that demands all the nations of the world to disarm in one year or have all their battleships destroyed. This letter, signed "The man who will stop all war", is ignored by Orrington's fellow reporters and by the U.S. government, but he decides to dig deeper. With the help of Tom and Dorothy Haldane, Jim Orrington embarks on an adventure around the world trying to stop the man who is determined to end all fighting before he catapults the entire world into chaos and war! - Summary by Adele de Pignerolles