Classic Penny Parker novel.
_CONTENTS_
CHAPTER PAGE
1 HELP WANTED _1_
2 EXPLOSION! _10_
3 SPECIAL ASSIGNMENT _18_
4 THE MISSING PLATES _26_
5 SHADOW ON THE SKYLIGHT _35_
6 BEN'S STORY _44_
7 MAN OVERBOARD! _52_
8 A SWINGING CHAIN _61_
9 THE METAL DISC _69_
10 COUNTRY SKIES _79_
11 A FAMILIAR CAR _87_
12 THE PROFESSOR'S HELPER _96_
13 BEHIND OFFICE DOORS _104_
14 A NOTE FROM BEN _112_
15 THE DEMONSTRATION _120_
16 SUSPICION _128_
17 MAJOR BRYAN _137_
18 A SECOND TEST _144_
19 THE LANTERN SIGNAL _153_
20 A CROOK EXPOSED _161_
21 IN SEARCH OF WEBB _170_
22 SALT'S MISSING CAMERA _178_
23 ESCAPE BY NIGHT _184_
24 A RAID ON THE _Snark_ _192_
25 PICTURE PROOF _200_
