 Heir to the Austro-Hungarian throne in hiding Prince Aleksander, and Scottish midshipman Deryn "Dylan" Sharp rescue Serbian inventor Nikola Tesla from the site of a 1908 Siberian Tunguska event meteorite blast.Along the way, Alek sees through Deryn's male disguise of Dylan on the organic airship "Leviathan" while gradually learning of Tesla's motives of using his invented weapon Goliath to end the war on his own.Alek destroys the inventor and his Goliath weapon under German attack in New York, triggering the entry of U.S. into World War I.