Rick and Scotty fly off to the Caribbean, along with Drs. Briotti and Zircon, in search of pirate treasure. They soon become entangled with foreign spies and a hurricane and Steve Ames and the U.S. Navy, and it’s a non-stop race to the treasure! – Summary by sjmarky     [chương_files]  

When the ghost of a Civil War soldier, killed visiting his sweetheart across enemy lines, comes back to haunt the Virginian locals at an old mine, Rick Brant and his ex-marine colleague Scotty decide to investigate. – Summary by John Walker     [chương_files]  

Thrown out of Russia by a powerful relative, a young American Boy Scout, Fred Waring, meets his Russian cousin, Boris Suvaroff, and together they discover the secrets of the advancing German army. Through perilous escapes, secret passages, and being captured as a spy (by both sides), they deliver their information to Russian intelligence. But Fred now has to face an obstacle even bigger than he had realized. John Blaine is a pseudonym of Harold L. Goodwin. (Kangaroo)     [chương_files]  

“Foster, Lieutenant, R. I. P.,” blared the voice horn, and five minutes later Rip Foster was off into space on an assignment more exciting than any he had ever imagined. He could hardly believe his ears. Could a green young Planeteer, just through his training, possibly carry out orders like these? Sunny space, what a trick it would be! From the moment Rip boards the space ship Scorpius there is a thrill a minute. He and his nine daring Planeteers must cope with the merciless hazing of the spacemen commanding the ship, and they must outwit the desperate Connies, who threaten to plunge all of space into war. There are a thousand dangers to be faced in high vacuum—and all of this while carrying out an assignment that will take every reader’s breath away. – Summary by Original book cover     [chương_files]