What's shaped like a sting ray and flies over Chesapeake Bay? This is the eerie riddle which confronts Rick Brant and his friend Don Scott when, seeking shelter from a storm, they anchor the houseboat Spindrift...
Tom has had enough of adventure and swears he is going to stay home and live the life of a sedate scientist, working on his many patent applications. He spots a magazine article written by Professor Bumper describing...
Barcoe Jenks, the nervous and eccentric financier, enlists Tom's aid to travel to Colorado and determine the method of making artificial (and perfect!) gemstones -- the secret of this method having been used...
Eat your spinach, little man! It's good for you. Stuff yourself with it. Be a good little consumer, or the cops will get you.... For such is the law of supply and demand!
Times have changed. The Great War is over and money is getting hard to come by. Mr. Damon shows up with a new friend, who promises wealth from the bottom of the sea. Tom reluctantly agrees to join the search...