Europe 1934: Captain Steven Hawklin, known worldwide for his daring exploits, he is adored by many, revered by others and considered one of the greatest flying aces of the First World War. Along with his close friends Hardy Miller and Oscar "Oz" Lyman the three have traveled the world seeking adventure. When an old friend and mentor, Orman Wintergreen is murdered Steven travels to England to console Orman's widow, Desa. While there, he uncovers an insidious plot orchestrated by a vengeful sub-mariner, Victor Eichmann, a relic from the Great War who is unable to accept Germany's defeat. When the desperate scheme unfolds, Steven learns of a new untested explosive that, when used, will cause an undersea earthquake so massive it will bring about the destruction of Great Britain and throw the world into another war. While Steven sets out to find the German mastermind, Hardy is sent to intercept the new explosive and prevent it from arriving in the hands of Eichmann before he can put his plan in action. Steven and Hardy learn that Victor Eichmann has powerful associates whose objectives are to stop them at any cost. In a vain attempt Steven dives deep to the ocean floor in order to meet the underwater menace head-on, in hopes of preventing the earth shattering catastrophe and saving the world from the wrath of a German madman. Captain Hawklin and the Underwater Menace is a golden age adventure story, filled with Heroes and villains, swindlers and thieves. It's an adventure with hair raising cliffhangers that will keep you guessing till the very end. Inspired by the cliffhanger serials of the 1930's and 40's in the tradition of Buck Rogers and Commando Cody.