The fourth and final book in the Air Mystery series (originally published as the Sky Scout series). Van Powell weaves a mystery tale of adventure and surprise in this tintilating mystery novel! Fans of...

I.A DEAD LETTER COMES TO LIFE II.THE MYSTERY BOYS ADD A MEMBER III.GOLD, AND A LIFE AT STAKE IV."QUIPU BILL" V.THE CHUMS PROVE THEIR METTLE VI.A NEW MYSTERY DEVELOPS VII.CLIFF TRIES A RUSE VIII.THE OUTCOME...

Second entry in series of teen aviation stories, filled with lots of scientific jargon, a jewel heist, and adventure. Van Powell is a pseudonym of early Hollywood screenwriter, Ardon Van Buren Powell...