Bottom picture of Grosset & Dunlap cover was sent to me by Mark Snyder. Note: some of the language, references & attitudes, while acceptable at the time they were written, are not Politically Correct, today. Summary: No official summary was ever provided with any of the old Tom Swift books. The book opens with Ned Newton working on "small, but complicated mechanism." Ultimately, we find it is a "pocket wireless sender" to be used to communicate via a cipher code if/when one of the chums is in trouble. He proposes to Tom that a means of seeing through brick walls would be invaluable in "finding criminals and anyone who might be kidnapped." Tom has other things on his mind, and pooh-poohs the idea. It seems that a secret vault, located below his lab and protected by double-locks and alarms has been penetrated, and a small wooden box containing the formula for a deadly war gas has been stolen. Tom must recover the Titan Rise Formula before it can be used to cause death & destruction at home and abroad.