Episode 1: Dr. Ralph Burke, a scientist and inventor, perfects an apparatus enabling submarine craft to remain underwater indefinitely without relying wholly upon compressed air stored in the boat. The discovery is perfected at the opening of the story and has been offered to the United States government. Lieut. Jarvis Hope. U.S.N., is dispatched to witness a practical demonstration of the invention. Arriving in the city where Dr. Burke lives, Lieut. Hope meets an old acquaintance. Hook Barnacle, whose life he once saved. Hook had his right hand bitten off by a shark, and an iron hook being substituted gained for him the odd sobriquet. Hook escorts the lieutenant to the Burke home and relates to Cleo, the doctor's "daughter," how his life had been saved by the young naval officer. Cleo and Hope become mutually interested. Hook is much given to talking and it is not long before the entire village knows the reason for Lieut. Hope's visit